Neptune, I don't know if you've noticed but on IMCDB have you seen an account name under Notexplorer4x4? I've seen that profile name around but I think his comments were all deleted. I just wondered if you've seen the name before. Anyways antp said something about finding out old users by e-mail accounts.
http://forum.imcdb.org/forum_topic-2392-Fellow_haters.html

A comment is there when I once asked him about finding banned users.