Sounds to me like the cops are being lazy and assuming you are too dumb or scared to follow up or seek out real legal advice.
however, the reason I asked if there was damage is that would be worth pursuing further and isn't ignorable.
I actually had something kind of like that happen in my truck. (and yes, they don't want to do their job and it has always seemed that way.)
They had just graveled the roads and the posted speed limit was 15 on the fresh gravel but some A hole doing 60-70 passed a couple of us going the other way and it put two rock cracks in my windshield, one in the left headlight and one clear through my front signal lens. (speed limit was normally 45 anyway) not 60-70.
I turned around and took a picture of his truck and license plate at the next light, but they wouldn't do anything about that either. "Serve and protect" my ***.
I even asked them if doing 4 times the posted speed limit wasn't enough, but they said it was what they called an accident and there was nothing they would do.
I swear, they don't want you looking out for yourself any more either.
They want you to just take it, and if you show signs of not liking what your getting dealt then they pull the road rage card on you.
They never seem to take into account that some ******** caused it, and I'm more of a "You pay to play" type.
Now days it seems everyone wants to play but cry to the cops when it's time to pay.