They'll probably just hear more anecdotes from other survivors or possibly hear about how other nearby outposts have fared. With no communication technology working and limited fuel it would be hard to do much more.
Plus there's no way to verify then authenticity. I'd be worried about someone setting up an ambush. Obviously Herschel didn't want to add people to his farm and did so reluctantly after a child was shot, but still didn't seem to want to let them be there. He wasn't trying to make contact with the outside world.