GM's would have to either,
1.) Unperm the region so the chests could be opened or
2.) Break open the chest for the players.
This, would most likely be happening all the time.
Players would constantly making mod requests, calling a mod to come do either "1.)" or "2.)" stated above.
(which could be quite a handful for the GM's)
pillaging, while players are offline seems more OOC than anything, they're not at their kingdoms because of an OOC situation. If we're talking about RP, they would definitely be at their camps or atleast nearby