We've been keeping them caged except when we are there to watch over them.
When out, they immediately head for the pond - ponds are verrrrry good duck things.
However, cages are not. We've gotten a lot smarter about how to get them back in. They've gotten a lot smarter about how to stay out. Tonight it took three of us about fifteen minutes to do the round up. I wish there had been a fourth set of hands available - with a cam corder. So far I would call it a draw.
[The cage is not only to contain them, it is also there to protect them. We've Fox, Coyote, Cats, and Raccoons that pass through the property and I know they would enjoy a duck dinner.]