This thread: Topic: [Spammer Blacklist] The Shitlist, can be an example for you, if you want to make a list of account names hacked or change hands to someone else.
Just create one thread only, to deal with account switching hands issue, no need to [1] your account find [1] thread you created, one thread is enough to start it.
Now, The question is; Should I expose those accounts that seem to have changed hands two-three years ago?
It depends on you, if you have valid and reasonable evidence, why not.