Redeem in-game or via the SHiFT Gearbox website:
A couple of diamond key codes posted via Borderlands' Twitter account.
- WSK3T-6XFJF-5STRC-9TJJJ-BBTXR
- 5H5JB-B6X3F-5SJRW-ZBBTB-9W5JX
- W953J-FCFBF-C936K-9TTBJ-WFXWK
- CS5TJ-HJXB6-WSTRC-Z3T3J-W5TTZ
- C9WTT-6JXTR-WS3RW-H3TTJ-HFWS9
A couple of other random codes (golden keys / loot) that work on BL3, BL2 and BL: The Pre-Sequel.
- RRRJT-B5TB3-J3JBJ-BJJJB-WTHSS
- KZWTB-KXR36-WZJ65-ZT3BT-563ZF
- WCCB3-SCTK3-SZ3XB-3B3JB-5CFRS
- 5TC3B-J33TW-63R3S-JJ3JT-K6TCF
- RR6TT-SBJ3T-BBJJJ-TBJ33-FTBFX
- WS5BJ-H56BR-C9JFK-ZB3J3-XCXHR
- KKK3B-X535J-9S363-BBJJ3-SH53T
- CTWTB-X9ZHB-XBXT9-B3JTJ-3JKW6
- FRRJT-FJ3BB-BBJB3-TJTBT-B9B65
- CTKJB-KHZS3-FJXJS-3TB3J-3ZCKF
SF6JB-R333B-33BTT-3TB3B-RB3F3(expired)- WSCBT-R5BB3-66KX9-F3JBT-ZW3JK
- CSW33-HBBJB-R65XH-XJTJ3-CT963
- KHWTB-3CBJB-6XWFZ-6B3BB-T5CCJ
- 59CTB-CBXTF-59BF5-SBTBB-ZFFZS
You don't need to have / own the game in order to redeem the keys. Redeem first and then add to your game later.
Enjoy!
lol there's a rate limiter, you'd get "unexpected error" for like a minute if you redeem too fast.