Endangered Forest Fibers: How Brand Due Diligence Is Rewriting Paper Packaging Supply Chains

Where paper fiber comes from is becoming the hardest part of a brand's sustainability promise to prove, and the easiest to challenge. For the past twenty years, the design and printing industry answered the question 'is this paper sustainable?' mainly through third-party certifications. You bought certified paper, printed a logo in the corner, delivered the job, and met your obligation. The model was easy to scale, straightforward to audit, and simple to price. The catch is that a certification proves 'this fiber comes from a managed forest system,' but it cannot prove 'this fiber does not come from a specific endangered forest.' Those two statements mean completely different things

The partnership between British homeware brand The White Company and environmental group Canopy directly targets this gap. The brand pledged to eliminate all paper fiber sourced from endangered forests (including ancient and primary forests) from its packaging by 2027, requiring its printing and packaging supply chain to provide proof of fiber origin [1]. The real significance of this pledge is not the target year, but the shift in burden of proof. Brands no longer settle for a supplier showing a certificate. They now ask suppliers to answer a direct question: 'Where, exactly, did the fiber in this paper come from?'

Academic literature has a similar blind spot. Corporate sustainability due diligence is a mature subject in legal and governance studies, with extensive research on duty scopes, legal enforceability, and governance frameworks [2][5]. Still, these discussions mostly stay at the corporate policy level, rarely digging into how evidence actually travels for a single raw material through multi-tiered supply chains. On the other hand, research on due diligence in mergers, acquisitions, and investing is well developed, offering detailed analysis of information asymmetry and diligence failures [3][4][6]. Yet those frameworks rest on financial and legal data. They audit books and records, not physical material flows that cross borders and blend in pulp vats. That is the exact gap in current discussions. Due diligence covers governance duties but skips physical realities. For heavily blended raw materials like fiber, we still lack an evidentiary methodology

This article makes three contributions, each corresponding to a section below:

・First, it defines the structural differences between certification-based compliance and source-based substantiation, explaining why the former does not automatically satisfy the latter (see the section on 'Two Evidentiary Paradigms')

・Second, it breaks down the chain of custody revealed by The White Company case, showing why printing and converting are the weakest links in the evidence chain and identifying the root causes (see the section on 'Breakpoints in the Evidence Chain')

・Third, it translates this analysis into practical workflows for Taiwanese small and medium print shops, designers, and brand owners, detailing documents, processes, and timelines (see the section on 'Implications for Taiwan's Design and Printing Industry')

This topic matters to Taiwanese industry because of where local suppliers sit in the supply chain. Taiwanese box, label, and paper bag manufacturers handle high volumes of regional orders for global brands, operating right in the middle between paper mills and end brands. When brands upgrade their requirements from certification to source disclosure, the first party asked for supporting documents is not the paper mill, but the converter issuing invoices directly to the brand

Existing research on due diligence falls into three main streams, with clear differences in what they examine and why. This section reviews each in turn, explaining how they connect to our analysis

Group 1: Normative research on corporate sustainability due diligence. This line of work treats due diligence as an ongoing obligation that companies owe regarding human rights and environmental impacts throughout their value chains, focusing on legal grounds, scope definition, and enforceability [2]. European corporate case law links sustainability with due diligence, examining how directors' duties and corporate purpose are being reinterpreted in court [5]. The shared position here is that due diligence is not a one-off pre-deal check, but a continuous management duty across the entire value chain. Its relevance here is providing the normative justification for why brands must trace fiber origins. However, because its unit of analysis is companies and duties, it does not tackle physical technical questions like how to trace the fiber in a batch of corrugated board. That is the exact gap this paper addresses

Group 2: Practical research on transactional due diligence. Due diligence studies in M&A and investing offer rich analyses of diligence failures: handling information asymmetry in hedge fund investments [3], why buyers cannot rely solely on balance sheets when acquiring a company [4], and how post-LOI deal breakups in US private company M&A shifted from financing risks to diligence-driven terminations [6]. The core insight from this group is that the real value of due diligence comes from discovering what the other party did not disclose, rather than confirming what they already claimed. We argue this insight transfers directly to fiber sourcing. A valid certification logo is something already claimed, whereas endangered forest fiber risks lurk in the blending stages that certifications do not cover. That is where the two diverge. To be clear, this literature examines financial and legal records, so its methods cannot simply be copy-pasted onto multinational material flows. We adopt its line of inquiry, not its mechanics

Group 3: Brand pledges in industry practice. The partnership between The White Company and Canopy fits this category. Brands set target deadlines to eliminate endangered forest fibers, pushing these requirements down to printing and packaging suppliers [1]. The defining trait here is action outpacing regulation, driven by voluntary agreements between environmental NGOs and brands rather than mandatory statutes. Unlike the first two groups, this approach pairs normative ambition (covering whole supply chains) with transactional precision (demanding named origin proofs), yet it lacks the methodological scrutiny found in academic literature

The intersection of these three research streams leaves an unresolved question: when the target of due diligence shifts from corporate conduct to raw material sources, and that material is physically blended and traded through multiple hands, what counts as sufficient proof? That is the question this paper takes on

Proving responsible paper fiber sourcing rests on two structurally distinct paradigms. Mixing them up causes most communication breakdowns in the industry today. This section defines both and explains why they cannot substitute for each other

Certification-based compliance operates on delegated verification. Brands trust third-party certification bodies to audit forest management and chain of custody. As long as suppliers hold valid certificates and proper logo authorizations, obligations are met. Evidence comes as certificate numbers and audit reports, proving that the system qualifies

Source-based substantiation operates on traceability. Brands require suppliers to provide named geographic origins of their fiber and reconstruct that trail for specific orders. The White Company's demand for fiber origin documentation from packaging suppliers is a prime example [1]. Evidence comes as origin lists and batch matching records, proving that this specific batch contains no designated risk sources

The defining difference lies in how exceptions are handled. Certification-based compliance allows controlled blending. Most chain-of-custody systems permit mixing in uncertified fiber up to a certain threshold, provided it meets minimum risk standards. This setup exists to keep the system practical in real pulp markets and is not a flaw in itself. But for a brand pledging to eliminate endangered forest fibers, that allowed mixing window is precisely where residual risk hides. That explains why commitments like The White Company's must require separate origin proof rather than relying solely on existing logos. A certification design with built-in tolerance simply clashes with a brand commitment built on zero tolerance

This structural gap echoes the core findings of transactional due diligence research. M&A studies show that the real value of due diligence lies in looking beyond disclosed financial figures to inspect what the other party did not state outright [4]. In the paper fiber world, certificates are the disclosed data, while endangered forest risks sit in the unstated pulp-blending zone. Demanding origin lists does not mean brands distrust certification systems. It means they are building a separate layer of evidence for questions that certifications were never designed to answer

Normative literature supports the same conclusion from another angle. Corporate sustainability due diligence is defined as an ongoing obligation across the whole value chain, not a one-time pre-purchase review [2]. An ongoing obligation means brands cannot use a valid certificate at the time of purchase as a permanent shield. They must be ready to answer where the fiber in any given shipment originated at any point in time. This explains the institutional pressure pushing the evidentiary burden from procurement desks down to mid-tier converters. When brands cannot answer the question themselves, they turn around and demand answers from the factories making their packaging

The weakest link in the paper fiber evidence chain sits right in the middle with printing and packaging converters, not with forest managers or brand owners. This section examines three causes behind this breakpoint

Cause 1: Mid-tier suppliers buy paper, not fiber. Print shops and packaging converters purchase reams, rolls, or pre-made boards from paper merchants and mills, not forests. When brands ask for a list of named forest origins, converters usually hold only paper specs and supplier invoices, with zero geographic fiber data. The White Company requiring origin proof from its packaging supply chain [1] means converters must turn around and ask their paper merchants the same question. Most small and medium shops have no standard process for doing that. The issue is not integrity. It is a structural mismatch in where information lives

Cause 2: Batch traceability lacks granular detail. Certification compliance only asks for a valid certificate at the company level. Source-based substantiation requires matching specific paper deliveries to individual orders or batches. Most small and medium print shops run production systems focused on work orders and lead times, without mandatory fields linking paper receipts to finished shipments. This is the most pressing technical gap for Taiwanese manufacturers. Even if upstream data is accessible, shops still struggle to reconstruct which paper batch went into which finished order

Cause 3: Material blending is standard factory floor practice. Using identical spec paper from two different merchants on a single job, covering shortages with leftover inventory, or switching to alternative stocks for reprints are all rational, cost-saving habits. Under certification rules, these practices are entirely compliant. Under source substantiation, they break the evidence chain. This mirrors the dynamic in M&A due diligence where deals collapse after the letter of intent due to diligence findings [6]. The issue is rarely deliberate concealment. Instead, as scrutiny deepens, previously accepted gray areas turn into unacceptable risks. Paper packaging supply chains are going through that exact shift in scrutiny

These three factors compound each other. The first forces converters to ask external partners for data. The second prevents them from mapping that data to specific jobs. The third means the connection was never strictly one-to-one to begin with. Stacked together, a financially sound print shop with all the right certifications can still fail a brand's origin audit completely

This section outlines practical steps for each tier of the supply chain. The baseline premise is simple: these demands test documentation capabilities, not material upgrades. Preparation can start right away without switching paper stocks

For small and medium print shops and box makers: the bare minimum preparation involves two documents, neither requiring new capital investments

・First, a routine process for requesting fiber origin statements: send written inquiries to current paper merchants asking for origin details and certification status for supplied stocks, then archive their replies in supplier files. The main cost is administrative time. The goal is establishing an ongoing habit of sending requests whenever onboarding a new paper vendor, rather than doing a one-off audit

・Second, batch matching logs: add a paper receipt batch number field to existing work order systems so finished shipments trace back to specific deliveries. If changing software is impossible, maintaining a standalone spreadsheet with four columns, Job Number, Paper Stock, Delivery Batch Number, and Paper Merchant, satisfies most entry-level audits

A realistic onboarding timeline requires one to two months of administrative prep to build documentation workflows, while batch matching logs take a full production cycle to test and verify. Preparing ahead of time is not about cutting costs, but avoiding last-minute scrambles during RFP windows. Once a brand's tender includes a fiber traceability requirement, the quoting window rarely gives you enough time to assemble records from scratch

For designers and design agencies: design decisions intervene at the material specification stage. Specifying a particular paper stock sets the baseline difficulty for downstream evidence. Common grades from established suppliers carry far lower tracing costs than niche, low-volume imports. Designers do not need to become forestry experts. However, during concept presentations, they should treat traceability data availability as a formal evaluation criterion alongside aesthetics, avoiding situations where a finalized design relies on paper that cannot pass brand sourcing checks

For brand owners: brands must recognize that demanding origin proof imposes real compliance costs on suppliers, which eventually shows up in quotes or shrinks the vendor pool. Corporate sustainability literature highlights the continuous nature of these duties [2], meaning brands cannot close the book with a single questionnaire. They need repeatable annual update mechanisms. A practical approach is tiered requirements: apply source-based substantiation to high-volume, high-visibility core packaging, while keeping certification compliance for low-volume secondary items, covering the largest share of fiber consumption with realistic audit resources

This study addressed a central question: as brand due diligence shifts from certification compliance to source-based substantiation, how does the evidence structure of paper packaging supply chains change, and how should Taiwan's design and printing industry respond? We reach three conclusions:

・First, certification-based compliance and source-based substantiation are non-interchangeable evidence paradigms, where the controlled blending allowed by the former represents the exact residual risk targeted by the latter

・Second, breakpoints in the evidence chain concentrate in mid-tier printing and converting, driven by mismatched information custody, insufficient batch granularity, and routine material blending, rather than supplier unwillingness to comply

・Third, preparation for Taiwanese manufacturers centers on documentation and recordkeeping capabilities, which can be established without switching paper stocks

Two specific limitations should be kept in mind when citing this work

The first limitation is case coverage. Our industry evidence rests on a single brand commitment [1], a voluntary agreement within the UK homeware sector. A single case study cannot support broad claims about the pace or adoption rate of wider industry trends. Our projection that brand RFPs will increasingly include fiber traceability fields is a structural inference by the authors, not an observed statistical trend, and readers should not treat it as verified market data

The second limitation is literature fit. The due diligence literature cited here comes primarily from corporate sustainability governance [2][5] and M&A or investment due diligence [3][4][6], neither of which originally investigated forest fiber supply chains. We drew on their core questions and structural insights, marking where analogies were applied and where arguments were original. Applying specific findings from those fields directly to fiber tracing would go beyond their original scope of validity

Future research can build on this work in three practical directions:

・First, conduct structured surveys of Taiwanese box makers and print shops to quantify how many working days they need to reconstruct paper delivery batch numbers for a specific order, a metric that directly reflects operational readiness

・Second, compare the quantitative gap between blending allowances in different chain-of-custody standards and brand zero-tolerance pledges, measuring the scale of this set-theoretic mismatch in real numbers

・Third, track changes in The White Company's supplier roster around its 2027 deadline [1] to test whether source-based substantiation leads to supplier consolidation, offering direct evidence for our cost projections

・Endangered forest fiber: Pulp fiber sourced from ancient forests or primary forests

・Due diligence: The investigatory obligation of a company to identify, assess, and address specific risks across its value chain

・Chain of custody: A verification system tracking raw materials from their origin through every transfer point to the finished product

・Certification-based compliance: An operating model that relies on holding third-party certificates as proof of fulfilled obligations

・Source-based substantiation: An operating model that uses named geographic origins and batch matching records as proof of fulfilled obligations

Reference link: The White Company Partners with Canopy to Eliminate Endangered Forest Fibers in Packaging

・Third-party certification proves that a system qualifies, not that a specific batch of fiber is free from endangered forests. Logically, the two are not interchangeable

・The White Company's pledge to eliminate endangered forest fibers from packaging by 2027, backed by origin requirements on printers and converters, marks a downstream shift in the burden of proof

・The weakest link in paper fiber proof sits with mid-tier printers and converters who purchase paper rather than pulp fiber, creating a mismatch between information custody and audit demands

・Preparation for Taiwanese manufacturers focuses on a four-column matching record: Job Number, Paper Stock, Delivery Batch Number, and Paper Merchant. This can start in spreadsheets without switching materials or buying new equipment

・Designers should assess the availability of fiber origin data during material specification, preventing situations where an approved design fails brand compliance checks later

For print manufacturing, this wave of demands is fundamentally about data management rather than materials science. Being able to pull up the delivery batch number and paper merchant for any past job within a few working days will become the real test separating supplier tiers, yet most small shop job-tracking systems lack these fields today. For designers, material selection is shifting from a pure aesthetic choice to one with compliance consequences. Design firms that include paper traceability assessments during client pitches can create a differentiated service that cheap competitors cannot undercut. AI applications here are clear but bounded: extracting document data and structuring supplier replies is well suited for language models, cutting substantial admin hours, but verifying authenticity still hinges on the credibility of upstream documentation. AI cannot invent missing evidence. In the SaaS space, an open niche exists in Taiwan for lightweight paper batch-tracking tools that sit between complex ERP systems and manual spreadsheets. Two questions remain open: first, when blending is routine on the shop floor, how granular must batch logging be to satisfy audits without paralyzing daily work? Second, without unified industry standards, custom proof formats from individual brands risk burying suppliers in redundant paperwork, a problem that only industry-wide format alignment can solve

[1] The White Company × Canopy: How Printing and Brands Can Avoid the Hidden Red Line of Endangered Forest Fibers

[2] Corporate Sustainability Due Diligence. Societal Company. DOI: 10.5040/9781509977772.ch-005

[3] Matos P. (2017). Hedge Fund Due Diligence at Leman Alternative Asset Management Company. DOI: 10.2139/ssrn.2974510

[4] Deeds D. (2026). Due Diligence for Acquiring a Company: Go Beyond the Balance Sheet. Entrepreneur and Innovation Exchange. DOI: 10.32617/1365-698a1f244f418

[5] Sjåfjell B. (2023). Corporate sustainability and due diligence. European Company Case Law (ECCL). DOI: 10.5771/2752-177x-2023-1-5

[6] Totter C. (2026). Post-LOI Deal Failure in U.S. Private-Company M&A: Diligence-Driven Termination and the Decline of Financing Risk. DOI: 10.2139/ssrn.6872639