Oh, yeah, one other thing makes this believable is that we have a wealthy couple highly educated in schmoozing and whatever and they managed to buy a vehicle TOO BIG for their garage ~ and they're driving in and out of there on top of all sorts of things like children's bicycles, work bench, tool boxes, hammers, rakes, broken stuff ~ and not a shelf in sight.
Not to push too hard on the point but people who drive their BMWs through their junkpile may be poking holes in the undercarriage stuff.
This time, I'm afraid, neatness counted ~ and they just weren't neat.
I'm sorry. You have to accept the convergence of far too many highly improbable hazards with that theory.
The general condition of this car appears that it's driver (if not otherwise incapacitated) could have easily escaped