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I know some people keep theirs locked up until a certain time of day to make sure they lay their eggs in their nest boxes.  I don't.  My chickens free-range and I let them out as soon as I get up in the morning usually.  I check on them frequently.  I also know their free-ranging "route".  They can be pretty far off from the coop and I'll see a hen come walking back to the coop, go inside and lay her egg.  When she comes back out she hollers to locate the flock and re-joins them.  If one disappears for awhile I go check on them, but I have never found one out of the coop laying an egg.
I suspect yours just aren't laying yet.