So, like I said, I was scammed, I've had nickname "You just made the list!". He scam me for 10 keys (I hope, that this kid is proud of himself because he do something amazing!). He wanted to exchange them for 20$ steam code. Like all scammers, he did exactly the same like many of them. When I send my part of exchange, he's gone and of course before he go, he must wrote "scammed". :D
My fault, that I don't record this, but okay, it's only game, there are many others, important things. :v. I did not expected, that person, who want to succeed on youtube, can do it this things. You can check in second pic, that on the beginning he wanted to trade for all of my 50 keys.
So I invite everyone of you for his profile on yt: https://www.youtube.com/channel/UCgFr0jQPn8OmNzO6uZOD6jQ