dashboard vin plate question

From what I hear from The department of motor vehicle a legal way is you have to sell the vin with the firewall. Not sure why that is considered a car. I am not in favor of this. I believe there was a Hemi Cuda or a 440-6 pack Cuda(can’t remember off the top of my head) where it was sold like this. It was considered complete car. The car is fully restored today.