ok - some of you are probably wondering on on EARTH I've managed to get 3 mystery eggs from my coop in the space of 10 minutes
this is the answer. It's perfectly legimiate (Zynga would never have let it stay in the community guides if it wasn't).
It's called coop stuffing and I found out about it yesterday while looking for something else on the forusm.
I forget to empty my coop before I went to bed - so harvested 20 chickens in one go.
But then I did the 5 chicken method - I emptied the 20 harvested chickens out, put 5 more in that were ready to harvest and the collected the eggs, did that one more time.
Tomorrow I'm going to try and do the 5 chicken method with all of my chickens 