quaeler; AFAIK, the "middle" overhead bin structure is mounted in all cabins, J through Y, "5 through 42" so we don't know which cabin it's from, from the photographs. Seat/row numbers are on the structure just below the bins (in the small lights that extinguish when the cabin doors are all closed in the installation I'm familiar with). That piece of wreckage on board ship, is by the galley bins (O2 masks etc), separated from the overhead bins so we don't know if they are associated.
I understand that the search for pieces etc is being wound down so we won't likely see much more than what we have already. I understand that the underwater search continues.
ELAC - absolutely superb summary of the nature of assessing, and of assesed, evidence.