Two cars had had a collision outside my home. I got their numbers. Unfortunately, an unattended parked car also had its near-side front wing damaged in the collision. I attached a note to its windscreen inviting the driver to contact me. This was torn off by an unknown person, as was a second note. The DVLA refused to help although I asked them to pass my info to the driver of the parked car. The police have also said they cannot help, but I cannot think why this should be the case. I see no good reason that this driver should be penalised when he was clearly innocent, but I cannot think of anything I can do that I have not already tried. Any thoughts?