Activate it as soon as possible. Some keys expire after a while. Expiration date varies from game to game or key to key. I don't know if there is a common expiration date for keys. If you activate it before expiration date, you'll keep the game your inventory forever.
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https://gleam.io/kNQK0/free-street-warriors-online
http://store.steampowered.com/app/417910/
Steam trading cards? YES
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