FSC Certified Products - Documentation?

In some of our current EB:O&M projects we have considered pursuing the MRc1 and MRc3 purchasing credits, claiming credit for FSC certified materials. How do we document compliance for these purchases? In the LEED Online form, it requests that "Documentation from Product Manufacturer's or Suppliers Verifying Product Compliance with the Specified Sustainability Criteria" should be uploaded. In many instances (when construction materials are purchased by the local contractor, for example) the "supplier" is not entirely familiar with the FSC certification or the need to document these purchases. For FSC certified products, there are a variety of routes we could take: - Cutsheet calling out material as FSC - Manufacturer's FSC Chain of Custody Certificate - Product Specific FSC Certificate (Does this exist?) - Invoice for products purchased, indicating FSC # (is this the COC or is there a different FSC # specific to each product?) - Photo evidence of FSC labeling on packaging for purchased products with receipt of purchase Has anyone had success achieving these FSC credits and what proof of compliance did you provide for review?