For a few days, no eggs at all! Or so we thought! But, it turns out our lovely girls just decided to lay their eggs elsewhere in the pen. We located a rather large egg horde underneath a fruit tree in the corner of the pen.
And, a few times since then, eggs have turned up in other random locations throughout the pen. They seem to be going back to their normal nesting box now, however.
I think the issue was related to the fact that we laid a fairly thick bed of hay through the pen. Plenty of new places to make comfortable little nests.