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Don't know how or what 'Thrift Store' works but you can try to return the thing.
If you bought it from a thrift store then you're probably hosed no matter what. Obviously it used to belong to someone else who had to activate it through Steam, and that activation is tied to their account. So even if you had the activation key, you wouldn't be able to use it anyway. Steam games are non-transferable.
My suggestion: Use the disc as a coaster, buy the game from Steam Store. That way you'll have the product key and won't be trying anything that'll land you in prison.