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this guy told me he would give me 100 dollars paypal and he did not come through and now he has three of my unusual hats.

http://forums.steamrep.com/threads/...-look-at-acceptable-format-before-posting.51/ - If you want to file a report like this, you're probably going to have to post trade histories, the actual chat window if you still have it, and probably paypal transcripts if it was a initated chargeback.

You provided no information at all. Please review the correct reporting format listed in the post above.