I lost two baby bunnies. I did everything I could to make them stay in their nest box. But I think the mom killed them. The first one, I thought it was injured because it couldn't walk. But when the 2nd one died, it was under a floor mat like something put it under there. Which I think was likely the mom b/c she was the one who knew where the babies were. When the 2nd one died, it seem too suspicious how two healthy looking baby bunnies could die in consecutive days, especially the last one being under a floor mat. And the vet did tell me mom bunnies can kill their babies, especially when I told them about the 2nd bunny that died.
I was so angry when both of them died, I was thinking of the future and how they look like as adult bunnies. And I did follow as many directions as possible from the people who posted, like trying to make multiple barriers so the babies couldn't get out. But what I think happened was the mom couldn't get them out of the cage, so she concluded by killing them.