In order to open a CS:GO container they found while playing, players have to buy a «container key» that matches their container from Valve with real money. Travelex says some in-store systems are back up and running after ransomware attack. Selling cases? Valve said the abuse had become so rampant that «at this point, nearly all key purchases that end up being traded or sold on the marketplace are believed to be fraud-sourced. Simply search for the item you wish to buy and pick the listing offer that satisfies you. Image: Screenshot.