Give it a little more time. Something may pop up in them. But there's always some occasional eggs that are infertile. 9 eggs out of 11 so far is very good!
They are a wild species and require permits. The largest they'll grow is 2 pounds. So small, about the size of a mallard. I wanted to try to hatch something different and a little more difficult to incubate/hatch . I've hatched many, many domestic waterfowl over the years. Since I was 10 years...
Here are my Northern Pintails I've managed to hatch! (I have permits for them, don't worry )
ETA: These were so fun to hatch. I haven't named them yet. They are just over a week old now. I also have black east indies getting ready to hatch next!