Po Lost Ebay Item What Are My Options?

Hello folks. Unfortunately last Thursday I decided to mail a USPS Small Flat Rate Box containing $50 face of 1976 Biecentennial half dollars, and today I received word that package arrived empty upon the post office. With such small profit margins as I was doing it just to make the coin counting a bit easier, I'm surely not going to be selling these again. What is the best solution that I can hope for besides accepting return since I taped around it (I sent a similar package today though it isn't as heavy with just 58 half dollars so I'll keep my fingers crossed) with some paper to give the package some stability and I even did a "drop test" by dropping the package five feet from the air and it didn't bust open, but unfortunately it appears that the Whammy took $60 from me. Has anyone else had similar problems with somewhat heavier coins as before I lost about 25% of a large penny lot in a large flat rate box?

Staff note: I have split your post out to its own thread. Next time, please start your own thread rather than ask your question in someone else's topic that is over a month old.