Very cool though I hope they make it clear that it's not worth going after items, even expensive items yourself if they were stolen rather than misplaced. Even if the police won't do anything about it and you know where the items are. In the bay area, they won't for instance. Just please don't go after it yourself. It will get people killed.
Depends where in the Bay Area - it's a big place with a diverse grouping of cities. My local PD would definitely retrieve a stolen item if it were airtagged, but I imagine Oakland and San Jose would be a very different case.