I was thinking more on this, you might be able to legally sue him. But can you sue for something that doesn't legally totally belong to you (virtual items) is what I do not know. That will be your biggest hurdle I think.
RMT has placed a dollar amount on any item you can find in the game. With a dollar amount on something, that gives it worth. That gives you a good shot at a court case.
You might have to get creative in how you look at it. Example..someone breaks into your house and steals all your drugs. Its not like you can call the cops for him stealing your illegal drugs but he can get in trouble for breaking into the house. Get my point? Im sure you can find something illegal he did if you look hard enough. Just depends on how much it means to you.
I would love to see something like this go to court and win. It would make people act more like people rather than they how they act with anonymity. It would be a landmark court case in a way. Would open the door for so many other cases. Maybe down the line making RMT liable for their actions too.
On a side note, one of mystics posts sounded VERY threatening. Wouldn't it be funny to get a PPO on him and him not allowed to be anywhere near you. You see him eating at a restaurant, go there too and make him leave. If he doesn't leave, call cops and they will arrest him. You can serve up to 90 days in jail and a fine for not following a PPO. You also have to turn in ALL firearms you own, are not allowed to purchase a gun during extent of order. There are other things a PPO will effect in his life and are very easy to get. You don't need any evidence to get one, I know from having them against me. May I also add it stays on your record, mine still shows up on background checks but it isnt active anymore. I know it made me not pass the FBI's instant background check for a one of the guns I have bought. I had to wait days for the background test to pass me when it should have been right there on the spot.
Also I would consider Chaos in on it if he hasn't done anything to help fix the situation. He has the ability to make this problem disappear...but doesn't. Heck he was prolly there when it was being done. Sounds to me like he supports what his fuckhead brother did...both losers in my book.
Most lawyers give a free consultation...ask them what they think your possibilities are. Won't hurt.
PPO = Personal Protection Order