Please make sure that documents are not attached to larger pieces of paper, as we are not able to process this kind of document. Each receipt should be loose in the envelope. Each individual document should also not be stapled or otherwise attached to other pages, unless the document is part of a multi-page document. You can read more about multi-page documents here.
If you are sending in multi-page documents, please make sure they are in the order you want them scanned and clip or staple them together in that order. We prefer staples, as paper clips can detach through the mail, but we can accept either.