Several years ago I wrote at length about how and why the North Koreans and especially the Chinese deliberately withheld repatriating American (and other) prisoners of war at the end of hostilities. The essay is too long to reprint here, bit can be found at
http://www.henrymarkholzer.com/chicoms_finally_confess.html. It is hard reading. When eventually the lab in Hawaii finishes with the 55 boxes just delivered by the North Koreans (which will be no time soon) we hope that some families will finally have closure. Literally countless others never will. For the reasons, please read my essay.