If there's a guarantee for Silicon Valley residents,
(Oh, thank you. A gift from the gods, reasons to blow off facebook recruiters.)
smash-n-grab car thieves fear nothing.
Last month, a coworker (late model Honda minivan) was out a side window, gym bag, old sneakers and used gym clothes.
Leaving your car unlocked is actually useless. If your vehicle doesn't have a locking trunk, don't leave it in the car. Period.