steamID64: http://steamcommunity.com/profiles/76561198158218237
I bought GTA V from him and it got revoked. Talked to several others who experienced the same with GTA V and H1Z1.
Link to one of his trades: https://dispenser.tf/trade/161297/
He has negative rep on there, but you have to press "MORE" to see it which is a huge problem for quick potenital buyers.
I've talked to him to sort it out, because he claims that the supplier is at fault, but he doesn't take responsibility. When store x can't provide a product for customer y after payment, store x has to refund or provide a new product of equal value. What can we do to stop him?