I had a few chest trolls in parties as well. But they did it not to annoy the other players but because of Greed. Hoping somebody who rolled Need or Greed doesn't want to wait till the timer runs down so they can have it. Sadly there is no "acting like a jerk" reason for reporting lol. All you can do is to shake your head and to move on. Some folks and their oh so precious loot.....