Hello, I am a regular ebay seller. I listed some auctions week ago. They ended on Tuesday. I took at the merchandise to the USPS office, I printed some labels for USPS Priority mail envelope and First class mail. When I went to the front counter the USPS employee said I can use the smalled usps box it was a 7x6x5 or something. I said are you sure these are for envelopes? I cannot use boxes? She said the Box is ok to use with the labels, its been 36 hours since I handed off the packages to the employee, now I am home checking the info on the DC# nothing shows up! I am worried if these packages will get returned to me because they were supposed to envelopes.But, the lady said I can use it with a box... I am very scared because the buyers will not get their items on time!!