No special wrench used by the dealers I've purchased cars from, here in New Hampshire. However, when I change out the dealer's temporary plates for my own, I've found there are 7 Phillips head screws and a single straight slot screw. This has happened for three different brands of cars. What's with that? Is this supposed to foil some would-be plate thief who may only carry a Phillips head screwdriver?
The two Honda Fits we bought had locks on the wheels, with a hefty charge added to the price of the car. I had them removed. If I want locks, I can buy them for a fraction of the price the dealer charges.