I hope a full car check was done. Has Graypaul been contacted, to varify the history. I would never trust a stamp. or even bills. Check for mileage, finance, and insurance?
Being in the motor trade for too many years, and seen too many 'bent' cars. The lengths, some will go to, to hide a cars history. Like, fully stamped book, mot's, to back this all up, even bills. Yet, all fake.
If it is clear, and genuine, then bloodyhell, well done that man!!!