The number matches Boeing parts manual
Leading edge is normally tucked up into wing.
Were the flaps up or down?
Trailing edge is chewed up - if plane went it with retracted, it would be at the back of the wing and should not be damaged if it went straight in. But if it were deployed as in a ditching / water landing it would be chewed up when it hits the water.
Dantrop Aviation video:
Pictures found on yahoo:
960 x 720 77.5KB
... Réunion: «Presque sûr que ce flaperon provient d’un Boeing 777
620 x 330 47.3KB
742 x 350 127.9KB
Réunion Island debris allegedly marked '657 BB' matches ...
www.todayonline.com/.../reunion-island-debris-allegedly-marked-657-b... Réunion Island debris allegedly marked '657 BB' matches Boeing 777 flaperon, newspaper claims ... “657BB” refers to “flaperon leading edge panel” which provides access to the “flaperon ...
Label matches drawing
833 x 959 75.5KB
620 x 330 27.8KB