COPO identification

[EZ Nova]

I know in Canada, you can get the GM documentation for these cars. BUT in the USA how does one find out if it's really a COPO or not without some original documents? This can also apply to ANY GM I guess.

I know of a local guy who bought a 1970 Chevelle SS396. Car was brought into Canada from the southern states 10-15 yrs ago. At the time the original motor was gone and it "supposed" to have a 1970 454. Our circle in town that knew the car knows it's a SS396 with air. A buddy of mine found the car and told another guy about it. He bought it that long ago. Immediately put 454 emblems on it. Now tells everyone it's a LEGIT LS-5 with air. He says you can not find out if it was or not since the USA has no paperwork on these old cars?

The barn-find thread just brought this back up last night talking with buddies.

Thanks, John