well, screens, or some other prooves, and he'll get banned(if y'll get lucky). If y don't have prooves, I think he won't get punished
Make a report on The report section of the forums Follow the steps. 1. State the offenders IGN. 2. Explain what rule they broke. 3. Provide proof. If you don't have any proof then Mods will check the logs of the chest you traded in, if you didn't trade in a chest there's not much the mods can do. Good Luck
Shouldn't this be locked or moved to the Reports section? Still, I wish you luck in getting your items refunded...