How to open Catty Corner Fortnite vault. How to Open Catty Corner Vault in Fortnite Season 3 Share on Facebook Share on Twitter Share via E-mail More share options Share on Pinterest … With the Keycard in-hand, interact with this terminal to open the vault door. Head right for the main building in the middle, and pick up a suitable weapon for a gunfight. Please try again later. Fortnite Keycard | Image Credit: YouTube Just next to the Vault door you’ll find a little terminal. Drop at Catty Corner in Fortnite Season 3. This feature is not available right now.