It took some real work, but I managed to get all Amazon deliveries UPS or FedEx. No USPS is a shipping option. You need to really work Amazon over with enough proof of losses and proven screwings. It took two months.
Did you have to do that over the phone? I have been unable to find any place on Amazon’s website where I can complain or get any kind of response. I tried putting a note on the addressing portion of the order form not to ship USPS but that didn’t work.