So I was just tonight telling my mother in law, who had her first free range eggs for dinner, that we've been so lucky with our first dozen eggs as they've been perfect little pullet eggs with super strong shells. So tonight I mosey down to the coop and open it up to find two soft shelled eggs under the roost... didn't check in there yesterday so it looks like I've got a new layer with soft shells (got two other nice eggs and only 3 squatting). From what I've read this can take a while to work out - they are already getting layer feed and have access to oyster shell. Not going to panic yet! What a weird little egg.