ELAC
...would identify the piece of flight control surface wreckage as being a portion of the wing leading edge that normally lies beneath a leading edge slat.
From the camber and rivet configuration my guess is that this piece came from the upper side fairly close to the wing tip.
I disagree, as leading edge is of much greater arc and joins to front of wing box. Seeing as the remnant in question appeared to have a complete airfoil (not a Nike like swoosh of the slats), this is much more likely a trailing edge flap. Perhaps it and the canoe were proximal to the recovered spoiler?
The small notch is the point at which an actuator rod extends through from the slat drive to the slat. In fact, a close look at the photo suggests that a part of the actuator rod is still present within the notch. Notches of this sort do not exist on the alierons, flaps, horizontal stabs or elevators, at least not that I've ever seen.
Flaps do have rods and notches - they are difficult to see even when fully extended.
Aeronautically yours,
Machaca