Ask the vet about lash eggs. Usually they are larger but they may come in smaller pieces like your seeing.
https://www.backyardchickens.com/articles/what-is-a-lash-egg-all-you-need-to-know-more.77939/
https://www.backyardchickens.com/articles/what-is-a-lash-egg-all-you-need-to-know-more.77939/