yea, just go back to barb village hole, go down, and use the portal to go straight to the treasure room. Keep going down and then go and open the final box.
The Wise Old Man just opposite of the draynor village bank, what's he there for? Is he from any quests? The security guard guy had him robbing the bank on the video but why is he there? Also does the books found on his shelves have any use?