I spent a lot of time hunting in the South and summers at relatives in the midwest. Buzzards are usually there in a short period of time. However, we don't always go investigate. In the Hannah Graham murder case she was found a month later. One of the locals stated they did find it odd there had been so many buzzards in that area a couple of weeks earlier. But they never went to look in spite of LE telling the public to be alert.
In the midwest, we didn't pay them any mind, UNLESS we had cattle. Still, when feeding the cattle one day in the spring my grandmother noticed one of the Angus cows was missing. When she didn't show at a subsequent feeding, they looked for her and didn't find her. My brother and I found the remains and her tag later in the summer - she had apparently been hit by lightning based on the marks on the tree she was under. No one remembers seeing buzzards.
What bothers me here is that LE not only is not warning the public to be aware of personality changes in a person they know, but I'm not hearing a lot of requests from LE to landowners to search their properties. I wonder why that is? On purpose? Or poor investigative skills?
I've wondered the same thing. If Mollie's body is lying in a field, or in a wildlife area near a river, there will be animal activity. When the Evansdale cousins disappeared, police did the same thing - they did not ask property owners to check their land. After several months they did ask people to think about their family and friends and reflect on change in behavior at the time of the disappearance, but that was so long after the event that most people probably ignored this police request.
I lean towards poor investigative skills combined with police wanting to be very careful to not tip their hand about what they do know. There must be a reason that her route has not been released, but it might be something as simple as not wanting to generate hundreds of tips from nutters who were on that route and now imagine they saw something relevant. Instead, police have asked everyone to report any small thing that may help the investigation.
At the same time, I think everyone within an hours drive of Brooklyn should check their property and adjacent wildlife areas for anything unusual - just my 2 cents.