Well, first off, chickens lay eggs from sun up to sun down for the most part including rain days. I find that after I have fed and watered them in the morning and maybe given them a few treats like bread broken up or a can of peas, they generally move to the nesting boxes not long after. I dont gather eggs until mid afternoon during the summer months because some of our girls lay in the afternoon if they have a mind to. Its good that you free range your chickens and yes they will lay eggs in the darndest places. Some have favorite spots and you will know exactly where to look for an egg once you find it. I am hoping you have a fenced in area so you dont explore too far in your search. A safe haven is a good idea if they use it and dont decide to spend the night in it and think it is a mini coop or new home for themselves. Generally if they are accustomed to the coop that is where they will retreat at night. Daylight savings time where we live can be troublesome when it is still light out at 9pm at night. Some girls like to stay up late and arise early. They dont always hit the coop when you are ready to lock them down for the night. I carry a spritzer water full of water sometimes to encouage them towards the coop door if they give me a hard time.Hope this little bit encourages you in your efforts.