A couple of things: Is that the FDR at the bottom of the photo in post
#1570 ? And in the photo in post
#1567, it appears that we are seeing the from the 'C' in the registration number forward on the left side (PK-AXC, that piece being upside-down). The break being behind that, wouldn't this be the forward section of the plane (or part of it)? Not the tail.
If that is the FDR, actually mounted to the pressure bulkhead, and if this is where the fuselage broke, the recorders could be in the debris between the sections.
And now that the tail (and other parts) have been located, has anyone reported hearing a pinger?