I'm sorry this happened to you.
We could definitely do with more controls on the FC Chest. In WoW we were able to limit the number of stacks people could take out and set an amount of gold for each rank, too (so we could cover repairs). Little refinements like that would be nice and would also help limit the damage in a case like this.

Unfortunately the system we have here is all or nothing, you either give access or you don't. Once access is granted to a tab, one person can clear it out and there is nothing Square can do because they had permission. I understand your frustration but as things stand, no rules were broken.
Our Company started out with the chest completely open, now we lock tabs 2 and 3. I'd rather not do that as I know some people just hate having to ask for things, but I learned from experience.

You mentioned FC Crafting, if your company lost any of the mats needed to unlock recipes we have surplus. Give me a shout in-game, we have plenty of mats from the airships going spare and I have a stash of crafting mats that I'll probably never use, hopefully we can help you out.