It's a key from "Cubicbundle Summer Sale Bundle".
Make sure that your account is not private, so I can check your game-list, and be sure that you are real user, not a bot or duplicate owner.
Good Luck!
Winner, Please mark as received!+)
166 Comments - Last post 8 minutes ago by adam1224
47 Comments - Last post 19 minutes ago by hbarkas
16 Comments - Last post 1 hour ago by pb1
881 Comments - Last post 1 hour ago by sensualshakti
1,390 Comments - Last post 3 hours ago by icaio
8,483 Comments - Last post 4 hours ago by InSpec
15,575 Comments - Last post 17 hours ago by devotee
23 Comments - Last post 47 seconds ago by FranckCastle
91 Comments - Last post 2 minutes ago by Xandie
11 Comments - Last post 8 minutes ago by RavenWings
52 Comments - Last post 8 minutes ago by matsalkoshek
2 Comments - Last post 9 minutes ago by escollo
8,058 Comments - Last post 10 minutes ago by CommissarCiaphasCain
43 Comments - Last post 10 minutes ago by RePlayBe