Invalid Trade Scam

The guy who picked me randomly, however, he asked me to trade my TF 2 weapons, hats and misc. I end up to trade with him. I ask him to trade me back. The next day, he didn't. I didn't ignore it until he begged me about my CS:GO weapons and my trading cards. I END UP ACCEPTING IT! Another day, he trade me with nothing! I suspect he is scammer. I start angry and message him. But he didn't. I reported him to Valve headquarters and all is I have to wait for my stuff back.

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