I would question the dealer on this. It should come with no holes (just two small dimples) in the bumber with the plate mount bagged and in the hatch. Then states where the front plate is required, they put the bracket on, the mounting screws go into the bumper through the small dimples.
When we got ours, we waited for the plates to come, then the bracket was mounted (MN requires a front plate). If I lived in a state that didn't require front plates, I wouldn't want to have the holes in the bumper either.