Yup, tried it and it works #1, only problem is I fear for server admins and such it will be a pain for the strongbox (like a chest that is a personal safe where you can hide anything you want) and even someone that has the OP status cannot open the strongbox if set to private or restricted unless he's on the friendlist thingy, tried this multiple times already with my brother, I wonder what can server admins do about it if they think someone hide some precious cheated/griefer items in a strongbox...