A lot of cars have had the cowl tag removed during restoration , I don’t know if it was. All I know is that when it was bought at Russo Steele auction about 2008/2009 ? it had a protecto plate and other docs, the guy I work for locally who is a well known collector says it had a McNeish report, I think the ebay seller is just a broker, and I also think the car has changed hands a few times. First guy was a local oil guy who made a few $ and also bought a 67 Z28 off the collector I work for. Stefano from Nickey knew the car at that time and it was sold off the block after it failed to meet the reserve. I bought a 186 head years before off the guy in Ca who restored it, think his name was Dennis, that’s why I knew about the car before the collector I work for bought it.
It had a warranty head put on it early in its life. The guy found the correct casting 291 head for it during the restoration at that time. Car has had GM 1/4,s also, the baffles were missing. It’s a very nice car, I have driven it and done minor stuff to it. IMO it’s a original Z28 with correct numbers, but anyone interested should due their due diligence and research it.