Probably should add more information for understanding.
He random added me, and asked if I was trading, I said yes and offered 9 keys pure for my unusual.
I thought it was going to be a simple trade, but instead he asked if I use opskins, and I have used it before so I was assuming everything would be okay
Basically he started walking me through this bullstuff to see if my taunt was "listable" on the market so he could sell it later. For proof he told me to make the listing at 1,000 so nobody would buy it. I clicked on input into inventory, and I got a trade offer from an opskins "bot". I knew that if I changed my mind I would withdraw from the inventory, so I accepted it.
Before he could walk me through some other useless garbage I noticed the taunt wasn't in the inventory of the site, it was in the bot's inventory. I tried calling him out, but he tried to play innocent, then I got another trade asking for all my valuable items for nothing, I told him about it and that's when it struck me because all he replied with was, "oh yeah it's for 'item verification'".
Looking back, I could say, "oh yeah there's where I could've caught a red flag." but from my standpoint at the time, I really couldn't.
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