Totally driving me nuts.
I'll be sad if what they find only further links someone to a particular route, but doesn't get them a lot closer to finding Gannon.
I think the sifters have only been there for two days max (and there couldn't have been as many yesterday). Before that, they were grid searching (quite a bit along fence lines) with poles, the kind they use to probe in snow.
While the FBI did not confirm it, the particular group that's there apparently has the ability to get electronics sniffing dogs.
Also, some dogs were taken to the house and then (apparently) taken back. Perhaps the dogs picked up an intermittent scent along the road/fenceline area.
They likely used metal detectors, as well, and there were probably lots of hits...