[RA1John]

I think the "sleeper" factor applies here.

Unlike a Judge or Trans Am, the RAII cars had no visual identification,
Plus, most were probably ordered with the intention of racing (1/4 mile or street).
Another point: Most were probably ordered by a customer; not the dealership.
Most of the Broadcast Copies I've seen have a "TAG_____" note on the bottom...
(only found on special orders)... with a last name.

From what I've learned about my '68 RAI Firebird Conv., the original owner special ordered it (last name is on B'Cast sheet.... "TAG COX"). Raced it for a time and then
sold it. The second owner had no idea that it was a rare, Ram Air car (because it was sold with the closed scoops installed). He was also a Chevy guy so the original "WI" engine was pulled and sat in the garage while a built 327 went in. Next owner didn't get the original engine but did point me back to 2nd owner who still had it. I would guess that many of the RAII cars that did survive ended up being 'converted' into average Firebirds... Ram Air parts missing.

Perhaps the original engines were destroyed (or pulled for an upgrade) leaving the car to live on as a 'regular' Firebird (or GTO). Not everyone knows of the Billing History or PHS. Not every car has been discovered (many still lurk in weeds, barns, garages).
Then there are those who own a Firebird or GTO who could care less about it's history;
They drive it and enjoy it as is.

I've heard more than one story about how some of the early Super Duty cars were found and the determination it took to track them down. It all starts with knowing the VIN. Once you have the original VIN, which State, Dealer it was sold to, the hunt begins. We may not be able to track down Osama, but we can find old cars

So, imagine if one had access to the VINs for all RAII or Super Duty cars. Suppose they also had access to files that noted which dealer the car was originally shipped to.
Now you're at least in the state/city. The search begins. DMV records, old Auto Swappers, Newspaper classifieds, insurance records, dealer records. A good detective has connections to info the average person can't access. The key is to know the starting point.

Wouldn't you like to be the person with that sort of access?