Checked the coop this afternoon expecting the usual. 2 eggs in the corner...I've tried to break them of that but so far unsuccessful...1 in nesting box 3 and 5 in nesting box 1...but today only 4...and one was broken. It was definately a hard shell egg. It also was not eaten which makes me think they smashed it by accident. The yoke and egg goo was all over the other eggs. Is this normal or should I worry? Oyster shell is always free choice and their shells are usually pretty thick.