LOL You make it sound like this information was imparted by God. It wasn't. How many times have we seen screwed up VIN stampings and we're only really looking at about 5% to 10% of total production in most cases. Not exactly a record to celebrate, or put much faith in.
And don't hand me any nonsense that workers in the 60s and 70s weren't showing up drunk, high, or both. Ever look at the way a lot of our cars were assembled? Try finding two 73-74 Roadrunners with their stripes in the exact same spots. I've seen cars that were so far out of whack you could tell the car was made on Monday as the worker was trying to recover from a long weekend. Again, we can find dozens of defects that attentive workers would not have made and we're only seeing a small percentage of overall production.
So sorry, but being a student of human nature, I can see the guy setting up the numbers for castings reusing their plates instead of making new ones.