Been using them as drop off for USPS packages prepostaged. Use them for shipping also, buying their service. Cost was high but overlooked that. One of my packages was lost after dropping it off and between their shop and post office truck. Owner refused to compensate me. Said it wasn't his fault. USPS said not to utilize a service like that if you expect it to be insured. It was insured but I never expected it to never get on the truck of USPS. I HAD TO REFUND AND EAT THE COST. Moral of the story, go to Post Office if you pre purchase postage!