I remember spending a day driving around Grand Cayman many years ago exploring all the little beaches and coves. One thing that struck me at the time was the extent to which the waves seem to sort the rubbish into objects of approximately equal size and density.
One small beach we found was obviously the place where lost shoes wash up. Large amounts of rubbish but almost all shoes. That leads me to believe that different components of any wreckage are likely to wash ashore eventually at different places or times depending on size.