Who leaves 10K worth of anything in their car? I get antsy leaving my $200 laptop hidden under my seat! This person is crazy. There is also no guarantee they person who stole the bag wouldn't dump the bag(with the hidden AirTag) and just keep the gear or that the police would help recover it even if you gave them the location(many times the don't).
It's not very risky to leave expensive items in the car, but in the trunk, not on the backseat! Also, never put these expensive items or really any kind of bag in the trunk after you park. Always do it before the ride. Or at least make very sure that no one is watching you. This is a basic safety drill. And it doesn't apply to expensive things only. You don't want your window broken for a sport bag with a sweaty t-sh…
I shot some pictures at a photo location, put the gear, in my camera backpack, into the trunk, drove 30 minutes to a completely different town, and stopped for lunch.
When I got back to the car, the stuff was gone. Thief had jimmied the driver's door and used the remote latch to open the trunk.
Surprisingly, my renter's insurance covered the loss without a hassle, except for a $500 deductible. But three days of pictures that I hadn't yet downloaded were gone forever :(