Are the soldiers who's ID cards were recently found MIA or POW?

I get the ArmyTimes and read online about these soldiers who have died. I remember last year there were two other soldiers kidnapped and killed and when they found them there were IED's around their bodies. Now, they have found one soldiers body in the river and just the ID cards of the other two. When I look at casualties and MIA/POW stats, these soldiers are not listed. Why are they not listed as MIA/POW and if you can provide some sources or materials that show they are it would be appreciated?