story. They just restamp it. Just look nice and give your passport to the woman on 3rd floor. You will have it back within 10 minutes with this stamp. No need to get a number.
I am married to my thai wife for 10 years now, so i do speak out of experience. During thema many visits to Thailand I am told a lot of stories about farang & insurance. And now I live here permanent I have made sure I am covered with the correct insurance as well as the correct drivinglicense. But what is your point, as long as nobody cares you do not need the correct license?
sh*t advice, are you proud now ? Do not ever turn to other people for help if you get involved in an accident, cause this behavior is very irresponsable.