Eggs on day 29 -need some help

[Haydenthebunny]

So found a nest on a fishing trip, the nest was all messed up and there was a cracked egg so I guess something got to it. There were 4 eggs (which I think are duck eggs) left that felt cold so I thought it was best to take them home and try to hatch them. They got veins on day 8 but after that it became to get harder to see them. The eggs are now on there 29 day but there is no pipping at all in any of them. I candled them the day before to check and they still look like they are ready to hatch. The one's air sack is even has a slope now. So if anyone could give me some advice I would be very thankful.

I am starting to get worried .-will try to get some pics soon id needed.-