There were several Chassis and Body Broadcast Copies attached to component-sub-assemblies. They were printed when the body assembly was staged for final assembly; each had a sequence number which was usually the order of final assembly. Cars were not built in VIN order. Not unusual to see the sequence number written on the body, sometimes on the transmission crossmember. A bud has two survivor Van Nuys '69 SS; both have remains of a BC on the rear axle cover. As a component was installed, the BC was discarded. Line workers called them 'sequence sheets'.
As the BCs were printed after the body assembly was completed with most of the interior installed, they are not found behind trim panels or stuck inside seats. The June 2020 HMN featured an original owner '69 Camaro SS. His Dad found a BBC inside the car prior to PDI. Had he not been there, it would have been discarded.
Giving some perspective, there were almost 700,000 1st Gen Camaros built. Of the 550,000 built at Norwood, I doubt 1% were delivered to the customer with a surviving BC.
