Do you have any airline miles saved up? Tell "Mario" that you'd like to come to Spain on a short vacation with the intention of instecting the plane personally.

Lots of neat stuff to see in Spain besides a jet. Your wife/girlfriend/whatever will enjoy it, too.

See if "Mario" will welcome you with open arms or make an excuse as to why he can't show you the plane (you don't really have to go...just SAY you're going).

BTW...We KNOW it's a scam but it could be entertaining to string "Mario" along.