What else can I do about this hit and run to my car in costa mesa, California area 8-22-14?

I've put $500 reward all over craigslist and facebook looking for a white Mercedes c250/c350 sport coupe pano roof that "hit and run" my parked Honda civic on the eve. Of 8-22-14 by south coast plaza area costa mesa, California. I've been including a picture of a white Mercedes c250/c350 crashed up in the front on facebook and craigslist postings. Is there any other things I can do?

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