RTA
Also, cross examination with any dog DNA from the kiosk in Braunschwieg or the recent Hanover search site, plus the vehicles LE have in their possession might prove interesting results if they turn up a match with Charlie or Frau Meuller.
They were apparently with him all the way from 2006 until 2012-14 until he starved them to death.
Charlie and Frau Mueller could be a serious lead and answer many questions.
Their DNA would likely still be collectible at all CB's locations/vehicles in that time frame. (a 'friend' maybe took care of the dogs whilst CB was locked up?)
IMO