That was an absolutely ignorant and probably arrogant thing to say.

You are certainly entitled to your opions about unions. Maybe you just had too many beers last night when you said this:

Purposely damaging Interstate Commerce is punishable by fines and imprisonment. Major parcel carriers like FedEx and UPS offer rewards to employees that help the conviction of someone tampering with Interstate Commerce. (Your box)

Damage happens to packages with all of the major carriers. They move millions of packages per day thru there systems. Packages fall off belt systems at sort facillities, shift during transit on rough roads, get jambed up in moving belt systems, and I guess in rare instances get damaged by a bad apple employee. You want to get a backglass across the country for $30 without having any damage, you had better sandwich it between two pieces of plywood and foam. You want to ship irreplacable pinball parts thru these systems for next to nothing compared to what they are worth, then here's a suggestion

Box it up then stand ontop of the box, kick that box across the room, drop it from 12 feet, maybe drive down the road and toss it out the window. If the contents survive your testing pick a carrier and spend some pocket change.