This is a hidden Shift Code in the Borderlands Teaser Trailer - Mask of Mayhem.
Other Borderlands 3 Guides:
- Tips and Tricks.
- Easter Eggs and References.
- How to Respec Your Character and Costs Explained.
- E3 2019 VIP and Shift Codes.
When you redeem it in either Borderlands 2 or the Pre-Sequel you get the following message:
Thank you for being excited enough to dissect the new bandit mask with the grace of Dr. Zed! As a reward, you have been granted Salvador's Community Day skin and 5 Golden Keys! There are more skins to be granted, so good luck out there, Vault Hunter!