Perhaps the mail truck had a flat and the jack was too short....
(Laugh, I didn't make that up, we had a $2000 piece of electronics used as a jack extender once...)
The really weird things is, the usps will just give you the shipping cost back, the trucking companies will give you the value back (from insurance) , but stubbornly refuse to refund the shipping cost, go figure.
I had a month long argument with one of the freight companies a while back, I was like, ok, you destroyed the thing you were shipping, and you expect me to pay you $150 for having done that?????
Un huh
The sad thing is I finally gave up, they agreed to ship the replacment for free, I paid the cost of destroying the first shipment...Grrr