Yes contact Steam Support. I had Prototype disappear from my library as well but got it back after talking to them since the original person who bought it got a chargeback for it so I ended up being affected but after explaining my problem they gave me access to the game again and made me official owner. Since your case is a key then they may have a different story for it.
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1 month ago i bought saints row the third Key for steam today i try to play it and i see its deleted from my account Wtf?
What i can or im suppoused to do with it?
(sorry for bad english)
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