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I have a single copy I'd let go for 3 keys. I don't have another, though, sorry :/
Dishonored incl. all DLC = 11 keys
Tomb Raider Collection = 10 Keys
Anno 2070 Complete = 10 Keys
Counter Strike Complete = 4 Keys or Two Pack = 7 Keys
Left 4 Dead Bundle = 4 Keys
Killing Floor Bundle 2013 = 4 Keys