A friend of mine, living in USA, went to check on a car being sold by an individual. He told me that the vehicle owner had covered part of the VIN that would have otherwise been visible through the windshield.
The owner said that he covers it for security reasons. And that it was still on the label attached to the part of vehicle frame that can be seen when opening the driver side door.
I have not heard of people blocking their VINs before, although I do remember reading about some people getting a key to a car they did not own from the dealer, by using its VIN.
Are there legitimate reasons to cover the VIN for security purposes?