sorcerous sundries questions

[Xyteno Sane]

1- next to the staff and the robe there is a booby trapped cabinet with a key inside. What does the key open?
2- is there a point to the top right office? I'm aware that in the top left office you can use the portal to get to the vaults but is there a point to the right one or is it just a couple of cabinets with nothing useful inside?

[Mike Garrison]

2. I've never even bothered going in there. I think it's a decoy. It's the bookseller's office, but if you talk to her (or you just explore the vaults) you find out that the books you want are in the vaults and not her office.

[Raelic]

Some of the keys are RNG, but they usually open either a nearby chest or door.

A lot of time I found myself just picking things instead of using keys. One of the people in the guild hideout is looking for keys you don't want anymore.

[Xanshi]

It's one of the key used on the counting house vaults. I don't know why it is name differently from the counting house keys.