Found a Duck Egg?

I live in a house where my back yard is a canal, where ducks live. We have about 6 ducks, they have chicks and lay eggs frequently. But today, my four-month old female puppy bought an egg to my backyard door. I picked up the egg gently and it had a tiny crack, but it was still warm, I looked everywhere in my yard, and I couldn't find a nest anywhere!

I went back inside and smelled the egg, it didn't smell bad at all. I put a wool sweater in a shoebox. I wrapped the egg in a warm towel and placed it in the box and put the box under a light. I also put tape on the crack. I have no idea what to do! Is there a possibility it's still alive?