Why not just disable the chest all together, I mean.....I don't know about you, but I would think it would be easier to just drag the whole chest to my ship then to try to carry all the coins in my wooden leg.
Well, honestly, I hadn't thought of that, but it is an option. An even better option would indeed be to make it a carryable object to put 'inconspicuously' in one's modest home... I haven't messed with object placement/furniture scripting, but, hey, it's an option.
I don't see why dragons would [censored] with human-made chests anyway. Are there any models of treasure-piles you can use, make them like chests, and have them deactivate once they're empty?
Another good point. One might even ask why they value human currency. Here, we're playing totally to the old trope of the dragon's hoard -- the big lizard who, for reasons unknown, values precisely the sorts of objects humans consider representative of wealth accumulation. Kind of big, scaly, tasteful bower birds with a penchant for sturdy luggage.
But actually, that was what I was originally looking for. It doesn't seem so, though -- I sure haven't seen any treasure pile mesh. If anyone finds one, though, I would prefer it.