Can you use the free boxes you get from USPS (the ones that say "Priority Mail") for First Class shipping? I've been using these free boxes to ship first class shipping for Ebay and encountered a problem for the first time. The buyer said that USPS wouldn't release the item unless an additional fee is paid for the box. I've been using these free boxes from the post office for shipping on Ebay first class and it's the first time encountering this problem. Am I not suppose to use these boxes for First class shipping? I'm new to selling on Ebay and these are the boxes I've been using to ship first class for the past two months this is the first time I've encountered this problem.
tree*fern
