Do I need to submit the purchase invoice or any other documentation confirming product acquisition when applying for Building Product Disclosure and Optimization credits on LEED Online? If we don't have to submit any invoice or proof of purchase document in LEED Online for these credits, how do we prove to GBCI that we purchased and incorporated that specific product for which we are submitting the sustainability certificate (EPD, HPD, etc.)? Does the Review Team trust Project Teams to such an extent that they do not require any documentation proving the acquisition of materials with sustainability certifications? I find myself accumulating over a thousand invoices and questioning if its really necessary.