Years ago when the limits were 3-4 ducks, and I had a very good Black Lab by the name of Molly she would find my limit, or darn close to it, without me firing a shot. If the birds were fresh I had no choice but to dispatch them, and take them home. I felt it was all part of being a responsible hunter, and being blessed with a Dog that loved to find and retrieve birds. From years of experience I do believe that many, if not most Wood ducks, are shot and not found, due to the dense cover they prefer. That's why when they increased the limit to 3, I just shook my head.
Cripples happen at any range, and a bird dropped ten yards in front of you, can be lost like the ones that sail 100 yards, or much more. No matter, it is always disheartening to loose birds.