Board Thread:General Discussion/@comment-34044658-20180811081214/@comment-36869183-20180911044555

my theory, he's the guild master, so he abused his authority, banned entrance to the vault then he just waited until there was only 1-2 people there and sent them on a short errand and stole a bit of the treasure...then rinse and repeat as needed until the treasure is all gone (and I know you said about no one ever being gone when you are there, however, while you never see anyone leave for work, it is canonically implied that the various theives of the guild are constantly running here and there throughout Skyrim for their own jobs in addition to what all they push off on you)