My 3 RIRs are 22 weeks old. One started laying at 19 weeks and the other started laying at 21 weeks. She is not laying consistently yet. I also have 1 who is not laying yet as far as I know. The one who began laying at 19 weeks has been laying an egg with a shell every day. I found 2 rubber eggs in their roosting area this morning. I didn't see them in there yesterday but they may have been there. I clean the shavings from the roosting area and nest box out once week every Friday so I know it's happened since then. One was broken and spilled as I tried to pick it up. I cleaned up those shavings. I also found what I think was a dried up egg membrane from what I'm assuming was a 3rd rubber egg. I'm not sure who they came from and I know these types of eggs are common from a new layer. The rubber eggs were not in the nesting box. I have oyster shell available for them but apparently they haven't been using it. I'm concerned I have a hen who's been hiding and eating her eggs. I will start being a little more vigilant but how do I fix this?