Back about 50 years ago, I was told you could tell the mileage had been altered on an odometer because the numbers wouldn't line up properly once somebody tried rolling it back.
I have recently seen cars for sale with the seller claiming really low, all original, documented mileage and the numbers were not lined up straight across.
I have owned old cars that have rolled over back to zero at 100K and the numbers were still all lined up perfectly.
Once you mess with it, it may never be right again.