I'm thinking to buy a second-hand car. Everything seems to be in order except one thing: the actual owner (X) is out of the country, and the car is being sold by his relative (Y). I will be paying by a bank cheque in the name of the owner (X), of whom I know the name, the address and the IBAN. The proxy (Y) will have an authorization from (X) to sell his car. I also have a copy of the car papers, with the name and address of (X) matching his bank account details.
What sort of checks I could do to stay as safe as possible in this deal? I'm thinking about calling the dealership where the car was bought and ask if the car with a given VIN was sold by them to X, and is it still under warranty (I expect them to cooperate since I'll likely be their client for revisions and repairs). I'm also planning to call the bank and ask them to confirm that the IBAN I have corresponds to the client X of theirs whose name and address I have.
Am I missing something obvious which puts me at risk because of the proxy (i.e. not because the car could have an accident, be under a lien, stolen, etc., I know how to check for these)? In my mind, as long as I'm sure I'm paying the owner of the car, he cannot both disappear with my money and ask me to give his car back at the same time. Are there any additional steps I could take to protect myself?