For those using the rare items snippet (Samson's, maybe others) there's something that probably got overlooked.
If you have clan store rooms and they save items dropped therein, you need to make sure people cannot drop rare/unique items in those rooms. A simple check in do_drop will take care of this and probably needs no explanation. I'd post my own code, but I changed it since I don't use rent, only the limited items code, and it might be confusing that way.
The problem seems to be that clan store room load after the areas and resets and after all the items are counted up. You can get really easy item duplication if someone drops a rare / unique item in a clan store room and leaves it across reboots or hotboots or the like.
Hope that helps someone!