Feel your pain. I've had that happen twice in my life.
The last one was 3 years ago. The hit-and-run car lost parts and a lot of fluid. The cop who took my statement looked around and suspected the other car had a garage or friend nearby due to the severity of the damage. My car was totaled.
The other was about 15 years ago. The entire passenger side was beat to bits. But this time went a little better. I kept searching around my apartment complex. One night, about 2 weeks later, I found a car that was damaged all down the drivers' side. Upon closer inspection I found large flakes of my paint still attached. I measured from the ground on both cars and they coincided. The officer who came to investigate my report agreed with my assessment.
The owner lived in my complex, so he went to their door (this was about 2am by this point). The officer used cop/jedi mind tricks, and since the person wasn't under arrest, their statement was taken as testimony. They admitted to being drunk (which they were charged and convicted for) and were also convicted of course for hit and run. My incredible luck this first time probably cost me the second time. lol