There was a youtube video about this a year or two back. It concerned the replacement of the speedometer/odometers in the Fedex trucks. When they failed and had to be replaced the new part started at zero and no mention was made to potential buyers of this fact. I believe the person in the video stated you could tell if there was a replacement as the original part did not have visible screws in the mounting to the dashboard, while the replacement did.
The video included an example of a buyer who encountered this and was more than a little bit upset. He thought he was getting a real good deal but wound up with a worn out truck.