Ilike your concept, but most items would be "in use" which is half the reason people go after them in the first place. Who wants to grind out an item only to put it on display and not receive the benefit of said item. I think a better option would be similar to the "/g (right click)item" that allows you to display that item in a chat log or link it to you bio. Maybe if you click on it and with a way to make a depositable (if thats a word) icon in your inventory, then drop it in the case as you discribe. The only issue with an officer or Leader having the keys to the case is the annoying need to have them around to display something. A different option could be that the Officer or leader could have cleaning rights to the cabinet.
I like the concept though!
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