These are photos of the landing gear attach points on L'Oiseau Blanc. Ralph Martin described the object Patsy Judge gave him as comparatively light, aluminum or stainless steel, no corrosion, bright and shiny, no wood or rivets, about 12 or 14 inches long, about 3 inches long at its widest part, with strange numerals stamped on it.
The parts manual for the Levasseur P.L. 4, from which the P.L. 8 was derived, lists the six attach structures as being made of "Acier spécial" (stainless steel). Logically they would not be attached to the wooden hull with rivets but with screws. Their very distinctive shape would make them easy to identify from photos of the White Bird so AVRO would not need to have the part numbers.