I honestly never thought LE would find JD in the MIRA facility, because I have never believed that she was dismembered or discarded in trash. I still believe she will be found, but it may be by pure luck rather than the ongoing investigation. I suspect that LE was probably hoping to find a murder weapon, and they most likely did not. Having said that, they are under no obligation to be truthful about what they may have found at this point. While I don't necessarily believe that it is what they are doing, is it possible that this is a strategy by LE to maybe make FD relax a bit and slip up and lead them somewhere? Just thinking out loud.