Forgive me if this has already been discussed, but I'm just now catching up from last night's posts.
From the article posted here by
tlcya (thanks, btw!), it sounds like her body wasn't send to the ME in Richmond; only her skull was sent. If that's the case they are REALLY being super careful in this investigation, making sure they don't miss a single microscopic bit of evidence.
I'm with everyone else here who thinks these are definitely Hannah's remains, and that hers may possibly be the first set of remains to be found in this area.