From a Wall Street Journal article, July 29, 2015 titled:
Plane Debris Consistent With Design of Missing Malaysia Jet
subtitle: Officials caution it is too soon to determine whether piece is linked to Malaysia Airlines
Plane Debris Consistent With Design of Missing Malaysia Jet - WSJ
Photos of the debris quickly spread around Boeing's offices as engineers and mechanics who design and build the company’s wide-body jets sought to examine the new clues. Several Boeing employees who reviewed the images separate from the official probe said the debris was consistent with the curved shape of the flaperon, a control function on the wing of the 777.
“This concave shape is indeed common to the 777 flap design,” said one longtime Boeing engineer.