I got my Model 3 a month ago. Love the car, truly, but there are two rattles that are really irritating me. I found one, but the other was in the rear and totally elusive. Long story short, I found an app that helped me find it instantly. Using this app, it causes any rattle spots to continuously rattle so you can climb back there and isolate them while the car is stopped. It can even be done right at the service center. Even better, right when you pick up the car for the first time.