M2M,
Could it be something else? Rodent, cat, spider monkey or teen vandals?
I don't have a solution but I can listen and offer encouragement.
well, my vote is spider monkey..

I figured that a rodent would have either eaten or stolen the eggs completely. They are still accounted for- just murdered. I just candled the prized Show girl eggs. Three are dead in shell.

And I cant tell with the little duccle egg because it hasnt been enough time.
I just went and checked and my sweet Sizzle is back to sitting on the two dud eggs I gave her in place of the duccles. I think that once the Show Girls are peeping I will give them to her. She can raise those surviving two for me- but now the odds of getting a pullet out of that is slim to none, knowing my luck...and that was my goal- to have a couple Showgirl pullets.
The Silkie is sitting tight on the standard eggs I gave her to replace those show girls. Those eggs are so big, I feel bad, but they havent been found thrown from the nest like the little banty eggs.
I have no idea.