I’ve shipped and received many packages and worked in the mail and shipping industry for many years. I’ve pretty much alway had good luck with the USPS. You can free tracking with Priority and standard package delivery. UPS and Fedex are so dam over priced.
The main problem I’ve seen is people don’t know how to pack things. Tossing it in a box and slapping a piece of tap on it while shipping a heavy box is asking for trouble. I’m amazed that some things I’ve got made it at all.
This sound to me like a scam by the seller or he just boxed it so badly it came apart, also on the seller. I doublt USPS is at fault here sorry.