Heck. I'd not even tell them if the mirrors got smashed. Too trivial, not worth the hassle/paperwork just to give them evidence to potentially be used against you. It's not lke there's a claim; and the streets aren't all filmed and studied by the secret police, yet. Did the vehicles even bother to stop ? After all their was no damage. And if there were, the drivers know they'll end up paying for their own repair anyway, so no one has an incentive to report. Forget it.