Suppose the four Golden Keys of Borderlands 3, delivered yesterday by Gearbox Software, would not have been enough. In that case, you know that you can now add to your inventory a valuable item to unlock the sizeable golden chest in Sanctuary III.
Make sure you have connected your Borderlands 3 profile to one of the different platforms (PlayStation Network, Xbox Live, Epic Games Store) on the official website. Once this is done, you can go to the page that will be used to redeem the codes and enter the following combination:
C9KBJ-6HXHT-9WJKW-BJ33B-SK95C
The code can be entered several times to unlock the gold key on all platforms in your possession. However, keep in mind that its validity is not infinite, and you can take advantage of this gesture of generosity by developers.