I tried to get a VIN on a car my parents bought in 70/71 or so new off a lot, a 68 Daytona.
No information in our state even from people that were willing to look at records.
My Mom had an old friend that is P.I. look into it as a favor and the crumb trail is not there. Depending on where you are your mileage may vary.
The dealership is still there but a combination of a partial fire in the early 90s and going totally to computers in the late 90s did it in.
It is sad how much information from prior to the past few decades has been lost.
Although, so much information can be gathered and stored now there will probably be more problems with that.
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"Yes, it's a real GTO. I know the scoops, spoiler, exhaust tips, and rear wheels are wrong. Umm, sure it's the 'big block' 400, you are quite the expert. I am driving in the rain, at night, running errands, with the kids who are eating and having ice cream in the back, after going to the drag strip, burning rubber, and blowing donuts. Do you really think it's numbers matching all original?"