As far as finding the original owner of my 68 Z28, once a NCRS report though General Motors Heritage Center and the National Corvette Restorers Society was obtained, I actually ran an ad in the local Craigslist in the town where the dealership was located back in 1968. I put it in the "wanted" section, asking if anyone knew the car that was sold out of that particular dealership in town. I got a few hits but it took a year or so before I got a solid one. A guy, who thought he remembered the car, and knew a couple of guys who worked at the dealership, went to work digging. He was a retired private detective, believe it or not, and he was excited to do some research.
Long story short, he found the guy who bought my car new, and we emailed and talked on the phone, and he sent me 4 or 5 pictures of the car when he first bought it and after he did some work to it. He only had it for 4 years and traded it in at Scuncio Chevrolet in RI where I am from, and Bob Johnson turned it into a drag car, and it was raced until I bought it in 1981. So, I was and still am, the second registered owner of the car, since it was never registered to anyone while it was raced. Yes, I still own it today, 42 years later, and now have the entire history of the car.