What does TF2 mean by “obtained by activating a retail version of Team Fortress 2”

team-fortress-2

I want to get the Proof of Purchase, but i didn't buy the game on steam. I got an item for the Mann Co Store. I bought the orange box on XBOX 360 though. Is there a way I can get the Proof of Purchase?

Best Answer

To get the Proof of Purchase, you need to activate a PC retail version of the game, receive the game as a gift, or had TF2 before it went free to play. Unfortunately, your Xbox version won't count. By "activate", I'm referring to adding the CD-Key to your Steam account's library, which can be done by clicking "Add Game" in the bottom left corner of the Library tab:

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From the TF2 Wiki

This hat is given to players who purchased Team Fortress 2 before the Über Update on June 23, 2011, those who receive a gift of the game, and those who activate a retail copy of the game.