I ended up talking to the FAA in Portland OR and they brought in your IRS department. So make sure the IRS knows this A..hole is taking cash for services IE he ain't paying the Obama portion.
If the FBI is involved, then most of your bases are covered. But the following are more options:
You can contact the Department Of Transportation for fraud as he delivered your car to the wrong location, out of malice.
Also, since the communications were via email, you can file a complaint with your State Police Department. They have an Internet Fraud Department.
If you used the mail, your can contact the Post Master General and file a complaint. They do not screw around.
All this includes the money he owes you for your original payment and/or the cost to have it get to your door.
Lastly, if you have an Attorney friend, hit'em up.