I’m not sure what you are asking. Is it about getting a hen to go broody or is it about the eggs disappearing?
If you are talking about getting a hen to go broody, I’ve tried that a couple of times and it did not work. Added a fake egg a day until I had a dozen, then left them for a couple of weeks. Some people are convinced it does work. Hens go broody because of hormones. Some hens, especially production breeds, have had a lot of the broodiness bred out of them. This is just my opinion, but I think if you have a hen thinking about going broody it might help, but it has to be in the nest she uses. If she is not thinking about it, I don’t think it helps. I’ve had hens go broody with no eggs in the nest.
If those eggs disappeared you need to figure out why. A hen can’t hatch eggs if something is taking them.