Try to keep in mind that a mailbox is also used by someone working for the postal service. If you inconvenience, hurt, abuse, smear or anny your mail delivery AND PICKUP provider, then you risk getting a note telling you to pick up your damned mail at the post office.
The goal of all solutions to a mailbox basher is to identify them, serve them notice, charge them with a crime and improve your mail delivery services. This helps not only YOU, but also neighbors on your route.
When you get the plate, call 911 to report a suspicious vehicle with license plate xxx-yyyy and a description. Listen in on the Broadcastify.com radio traffic in your state and county when the "Vehicle is registered to a Abbcdefg W. Qutying address is 3412 Blah road in the Township." dispatch is issued.
The rest is up to you.