Ahh.. well here is SOME help anyways.

www.publicdata.com

This site provides some basic information when it comes to public records. If I am not mistaken, there is a section where you can enter someones plate and it will give you a name and I think an address.. I have never used that particular part of their database before but I have used this site and think it may be of some help.

Drawbacks, it does not include all 50 states, and there is a small fee.. but well worth it, I am sure, if it helps return your player.