The Army still isnt done with its investigation, give them time to finish.
So far we have reports: (In no particular order)
1) ABC News team imbeded with 101st sees no explosives.
2) ABC News *finds* a video tape of the missing explosives. (Filmed by the crew that didnt *see any explosives*)
3) The Russians helped move them to Syria.
4) The US Army destroyed them.
5) They were looted by insurgents.
It's ALL speculation until the Army finishes its investigation. There might have been other reports, but these are the ones I recall off the top of my head.