Neighbor called me early this morning to tell me one that on of the duck was at his back door. i caught that duck but i couldnt find the other two. while i was looking for them i saw a large fox near the pond . well i was late for work and and i have duck poop smeared on my slacks. maybe i will find them when i get home.
just look and see what kind of condition the birds are in... if they look well cared for, healthy, move easily on their feet, then you will probably be ok. Take a good birding book with you, they usually have a good section on ducks both tame and wild.