I did get the rego for both cars and gave it to the cops. The cop i spoke to didn't look interested at all in running her plates. I asked if they could pass the details to her and the cop kept saying it depends if she lodge a report or not, they will not be able to get her - which i find it kinda strange. I would have guess it would be easy for them to cross reference the type of cars to the rego my friend and i provided.
so in case the cops decide to just shelf my printout details i gave them of the incident, i taught i best try here as well.