It is my understanding that the inserts were painted off the car, separate from the hood. The insert "assembly" was comprised of the main piece, the floating grille (with flat retainers), rubber "O" rings, and all studs.
When the insert assembly was installed on the hood, the nuts (with a red rubber material to prevent water from dropping through I presume) removed much of the paint from the studs when threaded on. The end of the studs should show some paint, and some might remain in the thread as well.
Also there is a TSB article (see pic below) that implies that the "O" rings were not included in the early models (based on the date of the TSB)
If yours does not have painted studs, I would probably try removing a nut, applying paint with a detail brush, then reinstalling the nut after it dries. I don't think anyone intended it to look pretty.
These are of course my observations. Most of the cars on Orlando last weekend were not correct. This is something I look for in junk yards and with unrestored cars.