Vault Key is a miscellaneous Story Item in Act Three.
A small iron key.
Properties
Miscellaneous Items
Rarity: Story Item
Weight: 0.01 kg / 0.02 lb
Price: 1 gp 
UID
LOW_CountingHouse_DocksChest08_KeyUUID
1c6e296b-9c74-46ee-a264-a04e151a2810
Where to find
- Carried by Cashguard Basher Vikki at The Counting House
Usage
- Unlocks a chest on the docks outside of the Counting House