Such loose objects can fly about the cabin during aerial maneuvers, damaging equipment and endangering crew.
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This particular excerpt says the debris was found in closed compartments.
So, how would you feel flying in an aircraft while trying to identify a sound you cannot locate?
Is it a loose screw, a loose panel, or is the wing about to fall off?
Is your seat/seat belt attaching bolt/nut loose?
Is the/an engine about to drop? or maybe one of the wings?
I bet you would tear that aircraft apart trying to find the rattle caused by a loose part or piece of sharp edged scrap metal rubbing on an essential wire or cable running through the “closed compartments” of the air frame.