think I know why chest won't open to some.... need to clear outer courtyard and if area is clear with spidey you can use the Open skill... (facing the wall its on the right behind the spidey)
We have read that /open would open it. Tried that after clearing the one guard camping it, but needed to melee it with the warrior. Pets didnt work. The chest has an insane regen rate so if you get interrupted for some reason, it will be at fill health again. The spiders that run in and out of the tunnel are very close to the chest but did not aggro the warrior. Chest had a pair or fairly nice caster legs, around 150 hp/mana.