The kit should look about like this. Last time I installed one was over 7 months ago. I live in DE and never needed them on my Rogue's (state only issues a rear tag), but I installed a couple when I worked at the dealership. As I recall, the two screws that are used to attach the holder to the bumper are the sheet metal type. There's a set of metal clips that slip over the tabs that a second set of screws go through to attach the plate to the holder.
It wasn't uncommon to have a car shipped to the dealership without the front tag kit. We'd pull a kit from one of the lot cars, and either the salesman or one of the guys in the shop would install the holder, free of charge.