Question involving a break-in that was in my car.?

Recently I parked my car with a gym bag in the penger seat, just had clothes and $150 dollars, at the time i parked my car there were many cars parked near it, and it was busy. The parking lot unfortunately in the back i found is not completely covered with a security camera so i was in that zone where it was not covered, great i know. So it became later at night and don't get me wrong i ALWAYS have parked my car there for around 2 years during weekends this has never happened to me and i would not suspect that my car would be targeted for just a gym bag in my car. So anyways they broke my window by smashing it with a sewer cap that was part of a sidewalk. Apparently my friend noticed where it came from when he was walkin at the sidewalk in front of the store which had a camera, so we basically have a tape of the people who did it, cause they took it from there in front of the camera. Than i call the police they sent a new officer who showed up to the scene about an hour later making me wait outside for that amount, instead of just telling me when they will be there. Than i file the report and tell them that they should be on tape of the people who have tooken it, everyone in the internet cafe already knows who most likely has done it, as they were these group of kids who have stolen from the shop before and have a restraining order from there but still show up there. The sewer cap was still in my car, so that should be proof, they took pictures of the cap and put it back on the sidewalk. They did not seem to care WHATSOEVER, the lady officer told me to call the number listed on the report i recieved and to make ME go give them a recording from the store, which the people from the store don't seem to really care, cause when i asked the guy told me that he didn't know how to work the cameras. So i dont know what i should do, should i go through the effort of getting the video and than find out where i should turn it in for the police ? Does anyone believe that they will be even investigating this incident? Does anyone know that if i get the video of them picking up the sewer cap would qualify for them to breaking in my car? I mean seriously what proof would it have to take, that these kids who have a restraining order for 150 ft from the place their at, taking a sewer cap right in front of it, which i would believe is another violation of public safety leaving a hole in the ground, and than mysteriously pops in my car with a stolen gym bag... I want these people to pay for my damages that ended up costing me around $400 dollars if i include the valuable and the cost of replacing my window which came out of my pocket...If not im seriously getting the closest bat, and i'll deal with this **** myself.