This scam works for more than cars.  I had a correspondence with an apparently rich Middle East buyer on and off for a couple of years.  Finally they sent a cheque for $67,000 more than the agreed amount.  Oops! A clerical mistake.

Would I please send them the $67,000 back?  I took their cheque into the bank and we had a good laugh about it.  It was pinned to the bulletin board for a couple of years.

These scammers have patience and highly developed communication skills and printing capabilities (certified cheque looked perfect).

Do your homework and make sure the money is absolutely in the bank before you spend any of your own money.

Cheers,
John Meyer