In any case, just now I discovered the silver lining.
See, our car has been dripping a little oil occasionally, so there's a piece of cardboard on the floor where it parks, to catch that. Except that the cardboard tends to end up in the wrong place, so when I got home just now, I stopped to adjust it -- and managed to lock the keys in the car, with the engine running, in the middle of our underground parking area. Argh. There's a downside to a reflex-habit of locking the door whenever I get out.
And, as it happens, the car thieves had broken into the car in a way that didn't involve specialized tools, and didn't actually damage the car beyond breaking a small bit of trim that I'd glued back together, and which had made it quite clear how they'd done it.
Thus, just now, it took me less than a minute, with only the assistance of a carpentry square, to replicate their work and get into the car and turn it off and retrieve my keys.