If UPS destroyed the package, UPS owes you money. File a claim immediately. You'll probably need to call UPS in the US to get the real story of what happened -- seems odd to me that they didn't just return the package to the shipper.
I'm sorry to hear of your bad experience with UPS. I find it a little odd that the shipper, having agreed with you to ship USPS, instead went UPS. Hopefully they'll learn something in the process as well.
On another note, "somewhat unique" is a term people use all the time, but it's incorrect. "Unique" means "unlike any other." If something is unique, it's unique -- no modifier possible. The correct term would be "somewhat unusual" or more simply "rare."
Don't mind me, I write about these little anomalies of speech all the time -- I sent Rex Murphy a note when he used the phrase "completely destroyed" recently -- again "destroyed" is a superlative, "completely" is redundant. Everybody's anal-retentive about something, I suppose ...