Sounds like a scam to me. Somebody trying to get info on the boat so that they can nick it.
When I was trying to sell my boat, I came into contact with scammers galore. [--word removed--]. Could smell them a mile off. One bloke even sent me a picture of his parents 'as proof'. I actually thought my boat might have been nicked the other day because a woman who had been interested in being my skipper and who had emails from me saying, 'Yes, be my skipper', suddenly died after I found her email address linked to a boat that sounded like mine and which was looking for crew in the Mexico area. She conveniently died 2 days after I sent an email to her asking if she had my boat! Then again, she may very well be dead and I feel like a fool and bad for thinking with such cynicism but hey, those bloody scammers have made my blood boil. Anyway, I phoned the marina and my lovely boat is all safe and sound and even the water in the batteries has been topped up. Bless.