not the only dodgy one?
looking at a few of the adverts for Helicopters on this site produces either keenly priced adverts or owners who's details seem a bit strange.
ie a 120 priced at 500K$ or a 44 where the owners name is both sir name and first name.
i would suggest looking them up on G-INFO and contacting direct or maybe just giving the deposit to charity - better than keeping some scammer in pocket money for a few months !