Ok it is a "General RVing issue because many RVers like to EAT. and many campgrounds do things like POT LUCK dinners and a common "Dish to pass" is deviled eggs.
An Egglet is a silicon "Egg shell" you take a raw egg, break it into the "Egglet" put the top on and drop it in a pan of boiling water.. Time it and then remove the egglet, and "Decant" (yes that is the word) a perfect hard boiled egg suitable for Egg Salad, or Cheif's Salad or Deviled eggs or ______ No pealing needed. Heavily advertised on TV.
Why they would put holes in 'em I don't know.