Unlike most wealthy people with a very recognizable public face, Steve Jobs didn't have any additional security at his home or anywhere in his private life.
I've had neighbors pull the same stunt for much longer in California. Like 4 years on the same car. They simply kept the dealer paper plate filler and the car was washed every week so it looked like it just rolled off the dealer lot. As long as the model was still in production police never bothered them. They kept the real plates in the glove box. They had a good reason to keep a low profile.

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CENSORED due to not family friendly words