I'm so sorry this happened, I know its not fun losing personal touchstones such a jewelry.

for future reference, I imagine more car break ins happen in places like fells because people are far more likely to leave valuables in there by mistake, so be extra careful in these areas. As for BPD, unless you have surveillance of the break in happening they're usually not willing to divert resource to stuff like this. Maybe check with nearby establishments to see if their cameras caught anything.

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Good luck.