I’m on the other end of a similar situation: my car was hit & run and the police won’t do anything about it, despite a witness who provided a license plate number and an admission to my insurance company (who is, coincidentally, the driver’s insurance company). I just received a letter from MPD saying they were suspending the case due to “insufficient information” on the other vehicle. WTF? So judging by my experience, you probably have nothing to worry about. In fact, the detective told me they usually don’t prosecute unless the damage is over a certain amount (he indicated several thousand dollars was the threshhold).