F*ck usps!

I sell parts that go from Austria, to Australia, for the past 13 years.
In all that time i never had a customer get back to me with a complaint, or problem, with an item being damaged in shipping, because i pack to survive all kinds of abuse within the shipping system.
I will bet a dollar to a doughnut, that your seller did a piss poor job on packaging that part in the box, to begin with.
Everything needs to be packed tight, to survive all the automated conveyor belts, and all the handling on and off trucks that a package needs to go through in going from point A, to point B.
Sorry in your getting a damaged part, but if it wasn't packaged properly. Firstly, blame your seller, and not the mailman, FEDEX, or UPS boys and girls.