Could be quite genuine, my family all live within those sorts of distances from me and we border counties so could be classed as a different county entirely, i've had to store a car on my mums drive before and sold it from there too. There could be dishonest intentions for not transferring ownership on his part though ie speeding fines etc..

Broken glass, i've had a car broken into and it took forever to clear up all the glass!

Could be plenty of explanations to debunk any of your concerns but while not a big headache if there's any doubt i'd walk away, especially on the strength of your other thread.