I would give them a call. They are very friendly.
I personally would call and ask them. If they are still small a hawk might pick them up and eat them. Its sad but that's Mother Nature. If you can find another group of ducks, see if they will follow them. On the flip side they might try n kill them because they are not from "that group". I've seen that too. The bigger ducks peck n bite the smaller ones until they just get so weak they die. Also, there has been a lot of cases of ducks getting botulism and end up dying it's a bacteria and a drink from dirty water sitting puddles and whatnot. I have had to take about seven ducks that have contacted the botulism to the wildlife sanctuary and they are given antibiotics and get better but if not the symptoms AR that they cannot walk their head they cannot lift their head their kind of discombobulated and they will sit in one spot until they die they won't move so you have to pick them up and put them in a box and take them there. Unfortunately this side of my house is it a duck Cemetery. By
They work with all wildlife with extremely limited funds. My 20 dollar donation went (helped admit 87 species) an incredible long way including a Florida Bonneted bat ,I didn't know they still existed, very important species .
They will tell you to let them loose. They will adapt naturally.
Thanks! Your answer is awaiting moderation.