After my two deliveries from Skoak the USPS has sent me separately documents that got detached.
I'm glad that they got the package to me and the paper materials not so important I guess (just receipt, custom forms). Makes me wonder how they are getting detached or perhaps it's just part of the customs process. The attached letter apologies for finding the materials "loose in the mail or damaged by mechanical processing equipment."
At least the shoes made it in one piece, well two really.