If I had to hazard a guess I'd say you've got a dogless hunter in your neck of the woods.
That would be my first guess too. Or someone who isn't that into eating them so they don't look too hard.

I'm sure an inexperienced hunter or dog could also have good intentions and come up empty handed.
My advice to a new hunter would be to have patience after the shot. There may be birds up ahead, but getting a shot on them is much less important than finding the bird you just knocked down.
After the shot, if your dog does not immediately recover the bird, go directly to your best mark of the fall and wait there until your dog finds the bird. Just keep quiet, stay still, and be patient. I mean patient, like, "I'm prepared to stand here as long as it takes."
Guys get in such a hurry.

They'll walk through CRP for hours to get a shot on a bird, but then give up looking for it after 5 minutes.
If the dog starts running a trail, I'll follow it, but will remember the area of the fall. You never know if it's the same bird that is being trailed... So if the trail comes up empty, I go right back to the area where I marked the bird down.
If enough time has passed and the dog hasn't found anything, I will make a big loop, like 100 yards, and come back through the area from downwind.
My dogs are only the best in my eyes, noone else's, but we get our birds.:thumbsup: