A heads up to your local or area game warden is always appreciated even if you do not have a name or tag number. Very seldom will you have a name and even when you do, it is of no value unless the person(s) is caught. A plate number is of more value but to make a case, the person(s) must actually be caught. There is no law against driving slowly down a road.
In you case, you said shots were fired. That might indicate a carcass. That is evidence that can be used at a later time and it certainly shouold get the LEO keeping an eye out around your property.
One of my closest friends is the asst. chief of law enforcement for our game department. I have learned a great deal from him and other LEO's about what to do and what not to do.