AS of Friday June 05/09 the official stance seems to be that NONE of the debris found belongs to AF447. It is entirely possible that they are not even in the right area. They were only searching that area because the last ACARS message was received at the approximate time they would have been in that area.
I would imagine that they are now re-thinking their search. It is possible the aircraft flew in some direction for a considerable time before being lost.