Fact:
There is no "new car smell" unless someone in the factory doesn't bathe.
Everything is so clean it has no smell. New car smell comes in an aerosol container, and the dealership puts it in for you.
My suggestion for production numbers is to compile a list of VIN numbers, as they would be assigned sequentially on the line, we can then determine who's was made before the next person, but I doubt we will ever know who is #1.