VIN Number location

The CHP makes a point; even though I have titled, registered car with current plates and tags, I can't prove that the they go with the car -- I can see their point. An officer is willing to work with me to get me a replacement vin tag. I've got the broadcast sheets, title, registration, owners hand book, and a build folder 6 inches thick, etc., so I hope I can convince CHP its my legal car.