I read somewhere on the Morrowind wiki that random loot containers are supposed to have their contents reassigned if you leave the area and don't touch anything in them. However, I tried this with a bandit cave (trying to get grand soul gems to pop up), and after exiting and re-entering the cell, the contents of the bandit crates remained exactly the same. Is this the kind of thing that needs to wait for the 72-hour clean-up?