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This guy gave money to an impersonator of my profile, he made a payment with EGD game cards, that I don't even know (since the scammer was already trade banned and couldn't trade with steam trade window) then blamed me as if I was involved, giving me my first negative feedback in years of trading.
He is incapable of identifying the right profile even when it should be as easy as clicking Visit Steam Profile that you can see above this Reputation tab. So I advice to avoid trading with him until he understands HIS mistake and modifies the negative feedback he gave me.