He obviously let them know that he wrote it down, thus the lack of joyride. Hey listen, yes, someone could confront you about it if it happened to you but it's not a judge and jury situation. Everyone's not a bunch of lawyers running around (thank goodness), this is not for a suit this is for sanity and respect. You don't need them to agree with you, you just need proof to throw up online and to not give them your business any more. Enough of that stuff gets online and they are out of customers, as it should be.Writing down the mileage does no good really. Think about it... You will know someone did a joy ride but there is no way to prove it. An owner of the dealership or a judge will say show me the proof that this was the mileage when you pulled into the service bay. You can't prove it unless you bring the service writer over, show him you are taking a picture of the odometer and get him to sign something that this WAS the mileage when you dropped it off.