3 years ago, I bought 36lbs of glass marbles for a game board project I was working on at the time... the seller used Fed Ex to ship.
I never saw that package.... by the time it got to my neck of the woods, there were only 3 lbs of it left. Shipper notified me later that the package had returned to him with a nice hole in it (33 lbs of marbles between TX and AL)...
Shipper then used UPS.... package DID arrive intact, albeit beat to hell and back.... luckily, no broken or lost marbles....