I bought 3 ducks to do a similar thing. I left them in the shelter for 24 hours. Let them out in the morning Went to work. When I came home one was on my pond, one was in a water ditch in the field, and one was I. The neighbors pond. I tried to catch the one in the ditch and it flew to the neighbors pond. Lol
I kept feeding the o e that stayed. Did not feed the other two. At the end of day 2 I walked over and gave them a half ration of food. All the time I was shaking the food to make noise in the bucket. Did the same thing the next day. On the third day of half rations I shook the food bucket and they flew to me I gave them a handful of pellets. Walked towards my pond and did it again. They followed me all the way. Once at the pond I made sure there was plenty of food. They do fly back and forth but mostly in my pond.
Hopefully you find them
I kept feeding the o e that stayed. Did not feed the other two. At the end of day 2 I walked over and gave them a half ration of food. All the time I was shaking the food to make noise in the bucket. Did the same thing the next day. On the third day of half rations I shook the food bucket and they flew to me I gave them a handful of pellets. Walked towards my pond and did it again. They followed me all the way. Once at the pond I made sure there was plenty of food. They do fly back and forth but mostly in my pond.
Hopefully you find them