I don't know about tracking, but I had a weird experience. I totalled my minivan, and not a week later, I started seeing offers in my spamcatcher email offering to buy it! I did not give that email address to anyone connected with the accident. Not the insurance agent, not the other driver, not the hospital, not the car rental company. How did these people a) know that the van was totalled, and b) where did they get that address? (Of course, once we filed the insurance claim it wasn't available for sale anyway.)