Anyone have good luck with the USPS finding their lost auto parts in the system?

I sent calipers to a member in HI and something similar happened (caliper came out). I took it upon myself to contact the post master from where it was sent and had him give me all the scans and sure enough they found the package in another state, set aside so it could be "inspected" lol.

The buyer eventually got it and all is well. You might have to work with the seller on him contacting his post master. Do you have the tracking #? Maybe track the scans and try calling yourself.