Would have been nice if they included the photo since there have been a few pieces found. It would be this one which to me looked like it came from a boat.
2nd piece found at La Reunion Island by the same person that found the 1st piece.
Found a decent video that's about the piece from Cape of Good Hope that says "no step". The video says it's possible marine life was washed off of the part if it was sitting on the beach. They also say that the rip pattern suggests a violent impact with the water but that they expect a flimsy piece like that to rip off 1st.
MH370: Interest in Missing Plane Drew Man Who Found Debris - Thu, Mar 03 -
Malaysian authorities have reiterated that photographic evidence suggests a piece of debris discovered off Eastern Africa likely came from a Boeing 777.