If you're satisfied with using them in compost no reason not to continue. I put eggshells out as calcium (along with oyster shell) and I compost some too. No issues with egg eating. But either way, the shells are getting reused.everything goes into the compost to be tilled in where we want to garden this spring. I had avoided giving them shell/egg because I thought I'd read somewhere it could habituate them to eating their own eggs. I guess not? They have access to oyster shell as they want.