That, BTW, has been the law since about the end of the Kingdom of Rome ~ and the founding of the Republica with its SPQR, and piles of law books, records and charts.
Although most folks encounter this law when the shipment involves unsealed food, e.g. frozen steaks that arrive rotten, it applies to anything shipped in glass ~ after all, glass is breakable!
The shipper failed to pack sufficiently to withstand normal handling. He should be happy to replace the items for you.
Sure.
I have lots of breakables shipped by UPS and Fedex, and they somehow seem to miraculously arrive intact, while the postal service looks likes it give the package the Sampsonite Gorilla Special Treatment, and they smile and shrug.
“So Sorry! Not our problem! You contact shipper. We have our money!”
Screw them. The USPS can rot in shipping provider Hell and shrug their shoulders. I am all too happy to let them carry letters they can mangle but I can still read, but I wouldn’t ship an indestructible anvil with their services.
Nothing personal to any mail carrier out there. Just making a living, I understand.