They flag those. If those plates stay the same then the vehicle is traceable. You can either actively trace it or you can run a historical search.

The point here is: "fuck up their data." Make the data WRONG. Make it so when they go to use it they embarrass themselves in a public and devistating way.

They have a giant database. And they're letting you (effectively) put anything you want in it. Load it up with shit. That's the one asymmetric warfare tactic you reliably have available to you here.