I found a list of codes, that may or may not be of use to people depending on if you’ve used them before (obviously). The source of this information is http://orcz.com/Borderlands_2:_Golden_Key

I have extracted the still active codes, and will separate them into Platform for your convenience.

Here is the Xbox list.

Golden Keys

2 Keys WTWBB-ZJ9Z5-69XJ6-KRTBB-ZHBBH

2 Keys WTWBJ-HKZ5H-XHFTF-WX3JJ-6HRS6

5 Keys WBWJ3-JHKSK-ZHXT6-CRTJT-BW59W

2 Keys W35BB-SC5S5-3JSBF-C63JT-TFHKC

1 Key KTWBB-XBRT9-WWZ3R-WXTT3-S3SX9

5 Keys KBWTB-T6XSC-JJHBF-WXBJJ-WRWKF

5 Keys KTKJ3-J95JT-HX93R-K6BBB-ZWR9H

20 Keys 5TKTB-W3J9R-TK5CX-5XT33-ZBBWW

5 Keys WBKJJ-FBHBW-TH6FH-WRT3J-35HT5

5 Keys 5JKJB-R5XCR-T9RXS-K6B3J-HXTXC

25 Keys CJC33-KHBCW-FHF6Z-C6JTB-F9395

5 Keys 5JWTB-SJHCR-JR6J6-CRT33-F5RKW

5 Keys K35T3-JC956-JXXBX-WXJTJ-HKF5J

5 Keys WT5T3-ZW956-TFFBX-56BJJ-T5HK3

5 Keys K35T3-X5HKR-3F6J6-WXBBJ-5BWTZ

5 Keys C3KBB-5CZWF-T6RJ6-5RBBJ-KF6SC

5 Keys KJ53T-BX9WR-B6FB6-K6J3B-JRH9R

5 Keys WJCBJ-KFHKF-JXXJ6-K6BTJ-K9HRR

5 Keys C353B-F69CX-JFR3X-WFJ3J-5RF5F

5 Keys W3W3J-96HWX-TXRTR-5FT3B-35WK5

5 Keys 5BWT3-3HZKX-T6X3R-5XB3J-KHTT6

5 Keys KJ53T-5S9C6-T6XJR-WRTBT-SSWH5

5 Keys 5T5BB-FHZCX-TXRJX-CRTJJ-FX3J3

5 Keys WJC3B-SSHCX-3R6TF-CRBTB-XC5HW

5 Keys K3W3B-3TJRR-TRFBR-CR33J-B6CTH

5 Keys W3W3J-CT36R-3X63X-WR3TJ-T95TS

5 Keys 53K3B-RTJRX-T66TX-WX33J-6T99X

5 Keys K3CJB-S3BRX-T6F3X-5FBBB-JH3WR

5 Keys KT5J3-3WTX6-JR6TR-K6TB3-JFHJR

5 Keys 5BK3T-CC3X6-BXRJX-5RBJ3-FRWB3

5 Keys 53WJ3-6536R-TXFTR-CRBBJ-BKXTZ

5 Keys KB5TT-9WT6F-TXXJF-5X33B-RBTZS

5 Keys KT5BJ-36JRR-3R6BX-CRTBB-TZ9T9

5 Keys CBK33-C63XR-B6RT6-CR3T3-H635J

5 Keys KBCJ3-FCXWK-XZRXH-WFTBJ-RTXKK

5 Keys 53KT3-KKXCW-FS6RS-56BJ3-KK9WK

5 Keys C3WTT-ZRTXR-BXXJ6-KXTBT-JZFHC

25 Keys C35J3-5XSSK-SH6RH-K63TB-39S53

5 Keys 5B5T3-J6TWK-ZSRF9-WRBBJ-C3S59

5 Keys 5JKJJ-HKTCC-Z9RXZ-CXTBB-H5W5B

Customization Items

Axton Class Mod CB5BT-T3JJ3-S6HTX-C63TJ-CSKSK

Gaige Class Mod C3W33-B5JB3-SRSBF-C6TJT-F35TT

Zer0 Class Mod KBKJT-K63C6-959TT-J3TJ3-9CBKS

Maya Class Mod W3C3T-3SJCR-S5HJT-3TTTB-6KKHJ

Krieg Class Mod WBWBB-FFTKX-S5Z3B-33BBT-6TC5C

Salvador Class Mod 5TC3B-9F3CF-SWSJB-3JBBB-SCTF3

Axton Head 5JK3B-S6KTB-5BB5X-CRTBB-FC3ZK

Gaige Head KB53B-TH5BB-KBB5R-WXT33-6HR9R

Zer0 Head 5TC33-9Z5BT-533WR-W63BJ-66WJW

Maya Head KB53T-3T6JB-W3T5F-K6B33-Z9W5R

Krieg Head K3CBB-CHWBB-WJTWF-WXBB3-K3KBK

Salvador Head KBW3J-F95TT-W3JKF-WFTBT-KF6XX

Wasp-Style Skins 5JCTB-FW95R-JCKKF-K6TJB-WSZJ3

Tiny Tina Skins

Gaige 53KJ3-HRR96-SHJWX-CR333-C65BB

Axton KJCBT-C9X9R-9STKX-W6T33-TZBBB

Krieg C3K33-3H69R-SZJ5X-CRBTJ-CJXK3

Zero W35B3-R66ZR-9ZBW6-5XJTJ-RW9RH

Maya CBCJ3-CRX9X-HZ3KX-KX3J3-Z9H5F

Salvador KTWTJ-3FF9X-HH356-5RB3T-ZK6FF

Loverpalooza Skins and Gun CTWTB-X3TBC-THXX9-C6JTJ-3JKZW

Luck of the Zafords K3C33-633S6-BKW56-56BBT-X9X9X

Krieg’s Loverpalooza Skin CJCTJ-K9JRX-3WKKR-5R3JJ-ZKRCJ

BL2 Pre-Sequel Heads and Skins

Axton as Athena KJWBT-FFJK6-TZXXZ-W63BT-363FR

Salvador as Wilhelm CBCBJ-JH3WF-JSR6S-KFTTB-CSBK6

Maya as Nisha 5BKTJ-9R356-BZRFS-KXJTJ-3WTKF

Gaige as Moon Moxxi W3KTB-HZBKX-3SXXS-5FBJ3-BC56X

Zer0 as Claptrap CTWJ3-CSJWF-JH66H-K6BTB-FB9WZ

Krieg as Scav CB5BJ-6S3CX-BZRFZ-CFTJJ-KWF6C