Those are pretty big dimensions to be part of a plane.
I heard someone who has been looking at the currents down in that area say that after 2 weeks debris can be 300 to 1000 miles from the crash site.
Hello Uncle Chip. Do a Google search on “777 emergency slide”. The slides are designed to double as life rafts. They are about 20m x 5m. They would also appear as an “extended U” in a photo from a distance. That corresponds almost exactly to the Chinese photo.