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I've used a visual indicator like this: https://youtu.be/kogvx43coqY since my rear window was broken 11 days after ownership back in August in Oakland and I'm still paranoid. Been still parking on the street in the same area every week now and haven't had any problems (knock on wood). Paired with the blinking LED for the rear windows, Sentry mode and w/ rear seats down I feel more confident now parking around these parts. Sad it's come down to this but with what I have in place should be enough visual warning for the perps to skip to the next easier target, good luck to all moving forward and stay vigilant.