Here's what I got from my inquiry, with some deletions for privacy:

"I received a request from someone asking for the username "sxxx xxn". I replied to his email saying that was fine, but that he needed to click the register link and register with that name...it's not currently in the database.

I haven't seen an update in the database, nor have I received a reply to my email.

We interacted via email...his address was mxxxxxxxr at aol.

If that's not the guy, I've got nothing. Please ask what username he applied for or what email address he inquired using.