I used reliable sites to exchange skins a couple of times, but my friend gave me a link https://dmarket.com/csgo-skins/product-card/awp-electric-hive , and since then I buy skins only here. By the way, I recently tried to sell unnecessary skins - and everything went just as smoothly. I withdrew the money without any problems, and bought a new AWP with the proceeds. Now I know where to make profitable deals.