I like it. It feels weird, when you can almost bet, that there will be nothing in that container.
Also add some miscellaneous items for collectors.
I don't know, whether it should be here, or as another suggestion. But it would be nice, if this worked also for containers in random encounters. With decreased chance/ammount of course. So there is something to do, while you wait for "Lockpick" cooldown etc. I can imagine it simillar to those caves you sometimes find items in.