Invoices for Non-FSC new wood

I just received a comment back from my LEED submission regarding needing to provide invoices for new wood items, plywood and flakeboard. I have listed these as new wood items, the plywood at 100% and the flakeboard at 0.8%, both of which are not FSC and accordingly their FSC percentages are both 0% on my IDC material and resource Calculator. I have other new wood items that are FSC that will get me the required percentage even with the Flakeboard and Plywood bringing down the overall FSC percentage. I do not have invoices for the plywood used or the flakeboard, but I am not sure why they are looking for invoices and backup since they do not help. I have also noted that the in the vendor invoice column on the IDC worksheet I have listed both items as "No" since I am not providing the invoice and there is no backup saying it is not FSC. The % vendor invoice at the bottom of the spreadsheet still totals to %100 since I have %100 of all the backup for the FSC related items. Please let me know if this is correct that they should be looking for the invoices or if you think I should make a formal inquiry.