I'm pretty sure you or Freddy told me you fixed duplication in the EXE? Lmfao.
Make all CS items capsule based.. meaning 10 Charms would be in a capsule which gave 10 charms.
Make sure that capsule is vendorable / tradeable, however the charms aren't.
You can also disable the edit button, but yeah.. you can't fix the duplication glitch fully as there will still be pots, scrolls etc so the best way to do it would be setting all sell prices to 1c just in case.
If you do not have file security, that would all be a waste of time though. Is kinda pointless now as like 50% of your community / donators would have duped so the economy is already fucked up.
gg.
Oh, there's also the worry that if you fix dupe everyone would quit your server.