GBCI had required invoices for all wood products, but has switched to requiring only invoices for FSC certified products, per the April 2008 FSC memo, which states that all invoices must be collected, but they do not need to be submitted. The reviewer does not need to see those to determine compliance.

Certified wood invoices must contain the FSC Chain of Custody (CoC) tracking number, and indicate whether the product is “FSC 100%,” “FSC Mix Credit” or “FSC Mix [NN]%.”