If large parts of aircraft have indeed ended up on the sea floor upside down of course there would be stress kinks and possible fractures to the skin. The tail area especially. This does not in any way give indications what may have happened in the air, especially with these limited view, murky images.
From what I've seen pinger locators have only been deployed (towed out) once and it did pick up a signal but sea conditions have stopped further deployment. That was as of yesterday, they may have managed today. Besides the divers / rov operators if briefed on what they are looking for (you'd hope) will have a good idea if boxes are likely to be there or not.