HELP! Body Number Location on 70 340 (H Code) Swinger

Not sure if all of those 'hidden' VIN numbers were originally done to satisfy a car owner or potential owner of the authenticity of the car. I would assume that more than likely they were added so that say an enforcement agent, such as a policeman or an MVD agent could make sure that a vehicles' issued VIN matched the title in more than one location. I can remember on several occasions, when I worked for a collector car lot in Washington, of taking an out of state Corvette down to the local MVD to have the VIN checked and them speaking of needing to check the 'hidden' VIN numbers, and the need for them to all match. One such vehicle did not have numbers that matched and the car was confiscated! (As I recall the MVD agents were not willing to explain where these numbers they were looking for were located!) Ben.