This is why I suspect Vinny isn't related to the mansion being bugged. Obviously the storage closet was bugged but I really can't think of any good reason why the closet - of all places - would be bugged unless someone was told to bug every room in the house... Which would assume Rusty's room is bugged too.
In CH6, Rusty verbally repeats the combination to the MC several times while standing right next to the safe. If Vinny is behind the spying, then he should know that new combination, but he clearly didn't.