The first edition of Jerry's book was compiled 1991-1992. At that time no one was quite sure when Chevrolet started applying the FMVSS label to the door. The Camaro in his book, N671208, was final-assembled on or about August 14. The body number indicates it was a 1970 model year build so that may have been a factor. The CRG db has a 1970 model year body number with an 07A body tag. Remember, cars were not built in VIN order and the body tag date had nothing to do with production scheduling. That car may have been final-assembled in August.
Another unanswered question is when the revised left door entered production. Norwood was shut down from mid-July 1969 to early August so there was plenty of time to make revisions to the door tooling. Just my opinion, I'd guess the revised door was in production for the resumption of 1969 production August 11. Did all cars built with the revised door receive the label at that time? Maybe, maybe not. Not unusual for the label to fall off over time.
The VIN range in question is N669000 through N678999, built July 11 – September 2. If you have a known original car in that range we’d like to know:
VIN
Body tag info
Early/late left door
Label y/n
