OK here's what I found:
AIM: Sh0pIifter
Alternate Forum (You could send him a PM there if his AIM doesn't work):
http://www.rpgelite.org/phpBB2/profile.php?mode=viewprofile&u=4Other than that I found that the last time he posted was the 19th and he had posted several times a day everyday going back till at least the 15th so something happened. If you look at his most resent posts there seems to be an abrupt end to his posting (in he was posting at a fairly constant rate and doesn't mention that he is going to leave or that he is getting ready to do so) which could mean that he was banned. Also his last post on the Alternate Forum was on the 8th so if you try to contact him there you might be waiting for a good deal of time.
That's the best I can do hope that helps, please update us when and if you contact him.
Some other things that might be him are:
IGN:
http://users.ign.com/about/Sh0plifter?boards=vnIGN Boards:
http://users.ign.com/about/Sh0plifterI think this is him because his IGN profile says he's 22 and which matches his gaia birth day (11 Oct 1981).
Also there is a Sh0plifter at GameFAQs but since there isn't a way to search for members at GameFAQs that probably wouldn't help much.