Why would you ever lend expensive gear and not even get a phone number down, let alone let the guy walk away with it?
If I let someone borrow my phone, I won't even let them get more than 5 feet away from me.
Safe bet he has a user account in one of the lancer evo forums under the name "lancer3vo". Start investigating detective.
BMW forum, last activity 3 weeks ago, so its a good lead:
http://forums.5series.net/members/lancer3vo-67576/
And at 250R.net, this is clearly him. Westminster is in the OC, so its gotta be the guy:
http://www.250r.net/forum/member.php?u=1617