I believe that it's possible. Not likely, but possible. The booby trapped ammo stories can definitely be true. The reason I say this is dad did one and a half tours in the 3rd Battalion 5th Marines in Vietnam from 66-67 when he was finally wounded. On patrols, there was one guy in his platoon who carried pliers, and after a successful ambush many times they'd take a round out of an AK mag, pull the bullet, put in a small amount of C-4, put the bullet back in, put the bullet about round 2-3 back in the mag, and leave it lying there with a weapon. Maybe it wasn't a reliable method of booby trapping, maybe it was, he never saw the results personally and did not know.
That's why I was really surprised to read that currently in Iraq, the Iraqi police will often times used captured AK ammo for their weapons and training (along with some US trainers). I would not want to be doing that personally.