As Randy Pitchford promised, more codes for the Borderlands 2 Shift network are now available, and can be used to obtain more golden keys for your collection. As per the usual, see THIS post for how to use these codes, as well as getting a key for signing up, if you haven’t already done so.
Xbox 360: K3K3T-H6B5F-J6FBX-563J3-BSHZX
According to Pitchford, these codes will be available for “about two hours”, so use them while you can or you will miss out on an easy golden key opportunity. If they do not work for you just yet, and it hasn’t been two hours, give it a little bit of time. “[If you] go too fast and they do not work, wait a moment.”