I was struck by the similarities with the relatively small but deep impact craters left by those 1990s 737 rudder-hard-overs and the Flight 93 757 that crashed at Shanksville on 9/11.
Apparently the total obliteration of the aircraft is not just due to the speed and angle of impact. As the aircraft noses deeper, the rear sections are met by rebounding shattered wreckage from the front of the aircraft, blasting back out of the crater, the combination of these forces is what practically pulverizes all material.
Any parts located are going to be small. Very small. Black boxes included.