Even without a VIN or a license plate? How does that look? How does LE figure it out?
Obviously, we're in the middle of your last option (crowd-sourcing). So far, nothing? Or did they get something and are mum? That seems irresponsible for LE, since Elantra owners everywhere are being stared at, mocked, or turned into tip lines. Clogging up tip lines is not good LE practice, so I don't think they've found it. Of course, they had an additional 1000 tips last time I checked (compared to two days ago).
What technology do you propose they use to find this car, exactly? 2011-2013 Elantras had no GPS, IIRC. If the plate was removed or obscured, what would they use?
We would be waiting for neighbors to remember or notice that someone has an Elantra (if it's not in a reservoir) or that someone had an Elantra and now doesn't. I, for one, have very little memory of all the various cars right around me. I'd notice if the three nearest neighbors no longer had one of their main cars, but two of them buy and sell cars as part of their overall way of making a living, so every few months, a new car is in someone's drive - I pay only attention to the ones they've had longterm.
Almost anyone can buy a camera-blocking screen for their license plate too - which is illegal many places, but there's little enforcement.
If the car did in fact drive past cameras elsewhere than on Taylor Rd/King/Queen Road, you'd think they'd tell us that as part of the request. If they have the license plate already, why are they asking us to find a car without that info? They're actually asking us to **remember** that car, but it has now shaded over into finding the car, as far as I can tell.