owner history, nicb report, original documentation and certification all conbine to create great provenance for a copo car.
i understand that chevrolet assigned the body numbers when the cars were accepted into the system for build. many copo camaros ordered at the same time by the same dealer had sequential body numbers. i am sure there may be exceptions to the rule, i suppose that in the end you have to be comfortable with the cars history and documentation. as a side note i agree that dealers did not select the body numbers for their ordered cars.