I'm not aware of all of them, but considering this[1] post from theymos, allegedly, the account
altoid belonged to him[2]. Apparently, he also had an account on Stack Overflow as well[3].
I know about altoid account, but it's very name is showing this is alt account from someone.
He probably used other accounts in bitcointalk forum early days, but he can always create a new account for his comeback.
However, if I was Ross I would not think about that after spending so many years in prison.