Here you go:
I'm not going to Moderate-edit my post #2, but cowboy up and eat the egg* off my face.
RichardD #6 is correct: they aren't for the holder per se, as I wrote, but they are the self-tapping screws that affix the plate itself into the plastic inserts provided. I had written "front" under the assumption you or the delivery center already had taken care of the rear plate.
*So: that was a nice tasty chocolate-coconut easter egg. Not a yucky 4-minute sticky gooey only-almost-solid-white-with-a-still runny-yolk-egg.