Excellent information I’ve never had any of the conditions and hope I don’t. This information will be helpful if I do. That being said, I have found the occasional rubber egg or empty membrane in early mornings under the roost. I couldn’t tell who they came from. I’ve found lash eggs once and a very strangely warped thick shell. Without anyone exhibiting symptoms I don’t know who it came from. It’s been probably almost year since I’ve seen a rubber egg.
Wishing you the best on your coop journey. Chickens have enriched my life immeasurably. I had no idea what I was missing.