I just popped back out to the coop after I wrote this and both boxes were occupied! The pullet in the nest box when I left was in the new box. She must've vacated the box for a moment and the other took advantage and hopped in. Now I think she's done laying since she's returned to the flock eating calmly. The black one, this will just be her second egg, is still sitting. And while they were both in the boxes, their "Third Musketeer" friend (hatch mate that has yet to lay) came in and started scratching and nesting on the ground in front of them in their boxes. I think she's a little lost with her two buddies occupied in a couple boxes. Maybe one day very soon, we'll have three layers!