We had a somewhat similar situation here. The lesson learned by the car owner was something like this....

BTW - I know this wont help your situation now, but for anyone else finding themselves in a like situation:

If you’re sitting next to a bus….You hear something hit your roof hard enough to leave a dent….You realize that it’s coming from the bus… Why the hell would you start thinking about contacting the transportation company and/or school at some later time?

The situation must be addressed as if you just had an accident with the bus. (in a sense, you did) You stop the bus right then and there (If not there. At its next safe stop.), just as you would with any other situation with any other vehicle rendering damage to either vehicle. You tell the bus driver what just happened. He is responsible for what happens on his bus. Including the actions of those on it which may render damage to those around it. The child’s parents are responsible as well. So why wait until there is virtually no chance that you will find out who the little sh-t is that made the dent?

You stop the bus. (BTW - Depending on where you are, you may not be allowed on the bus. So what?) You have the driver confront the kids. If nobody talks, you get numerous names (they may have to stay in the hands of the driver until he provides them to the school), and then you will at least have something to go with when you contact the transportation department and the school. It’s also important that you have the driver look at the damage to your car. Especially if it’s obvious that it just happened (dirt residue, etc.) He is to be kept in the loop until everything is settled.

You should get a police report on file, just like with any other accident. Your insurance company will more than likely want one.

There is nothing wrong with demanding that the school investigate the situation and provide either you or the police with the parents info if determined.

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1980 300D - Veggie Burner !