Gearbox seems to currently be in the process of testing out the new Shift system that is implemented within Borderlands 2, and they are now providing the fans with some codes to do so. These codes will give you access to Golden Keys per code you happen to successfully enter. As usual, see our Shift post to understand how to redeem these codes.
Xbox 360, 1k redemptions for 5 Golden Keys: 5TCB3-SRX93-BR6J6-5XTTJ-T5BXJ
PC, 1k redemptions for 5 Golden Keys: 5JKJ3-6TWKR-FJTBT-J3JJJ-FXXJT
PS3, 1k redemptions for 5 Golden Keys: 5TCB3-SRX59-CS3K3-9TWTJ-T5BC6
Don’t waste time as these will be sure to go quickly based on their lower than previous amount of redeems, and higher reward!