Keep your VIN number covered up.
Obstructing VIN = Violation of the law, possible Ticket.
Sufficient probable cause for police to force entry into the vehicle to investigate.
That explains something. I am in the UK and have an American car. The VIN is visible in the windscreen, the first car I have ever known like that, and it puzzled me why. I thought perhaps to save opening the bonnet (sorry, hood) to quote it when ordering spare parts?
I know of no jurisdiction in the US that requires you to physically change license plates every year. In Florida, the license plate is owned by a person and can be registered with another car when the plate owner sells or transfers a car. In California, the plate is tied to the car and they will not issue you a new plate unless you buy a car that has been taken by lien, drug forfeiture, etc. We just have stickers that you put on the plate to show you've paid the fees for the year.
Perhaps because, in the USA, don't you physically change the licence plate every year? In the UK the licence plate is permanent and is all that the police nornally need to know. You could physically and illegally change the number plate for a false one, but so you could change my VIN in the windscreen - only looks like a strip of metal stamped with the characters.