I really wouldn't do anything more than keep my insurance up to date. NEVER confront anyone breaking into your car. Even if you're both packing, there's almost never a good outcome. If you get shot or shoot someone else, is it worth it? If the car is in front of your house, you did the correct thing in putting cameras up. If the person really wants the mirrors, the sad reality is they will be gone...eventually. Good luck and try not to lose any sleep!

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'03 Carbon Black M5
'04 Silver X5 4.4
'04 MB SL500