Ok, this may not be what you are looking for but here it goes:
setup website (could be a brand new domain or a free blog service) then put a stats program on it, could be google analytics or w3counter for example. Donīt tell about the domain to anyone!
Then send yourself an email/pm/whatever to the hacked account with an intriguing title and content so the person clicks.
If you accomplish that you'll have all the info you need
Just and idea though, maybe its complicated but its the only thing I can think of right now