My mom's car had a few small dents from some neighborhood kids throwing **** at her car (not eggs, but rocks she thinks). The insurance wouldnt cover it for her. About two weeks later a hail storm ruined the paint and dented every car outside within a 5 mile radius or so of her house, including hers. Insurance DID cover the repairs for that (and the old dents as well, naturally) to the tune of $2500. She was really glad she hadn't paid out of pocket to fix the previous tiny dents.
Moral of the story: I don't know. But it sucks when kids throw **** at your car.
So far the only problem I have had is a$$holes scraping me in the parking lot. It has happened three times in the last two months and IM ****ED. Im thinking of keeping a couple of orange cones in the trunk and putting them besides my car when parked.
Sorry about your luck. I hope you get that covered or get some justice.