I don't believe anything they tell us. The autopsies may be done, may not be done, does it really matter? What are the autopsies going to tell us, that they were girls and they were shot?
I'm also not convinced they have DNA. It may be more misinformation. They may be going around taking swabs just to make the killer(s) think they have DNA. Could be more of their mind games.
If the killer(s) are local and they have DNA, why do they need somebody to come forward and tell them who did it? There can't be 1,000's of candidates for who did this if the killer(s) were local.