Hi,
That's a sad end of the third researches attempt.
Honestly I'm not surprised they don't find the black boxes.
But I'm surprised they don't find any substential elements of the plane .. who must not be the size of a shoes box.
Or the BEA theory of sea impact like described is false and instead .. the plane was partially or completely desintegrated in air .. or they had search at the wrong places.
With no more clues of what we have so far .. this must be the last one (wrong places) the most probable.
So .. another search campaign must be set.