Sorry, I missed where you said you pen them at night.
If you set up an area that is to their liking, they will use it. I've seen some made with cement blocks and others made as A-frames. They do like a place that has two exits, and it needs to be very camoflauged. I just let mine find their own nesting spots, as they usually nest within our two acres and fairly near their pen--the source of their major feed and water. When they start laying, they'll make a special "I've laid an egg" call, and will make a similar call when they're brooding and want someone to relieve them so they can go eat and drink. Once you get used to that call and the behavior of the rest of the flock, you can usually find their nests with a little time and patience. Their mates, and often the whole flock, are very supportive of their nesting and brooding efforts. After they start laying, if you observe them in the mornings when they leave their pen--being very careful to appear to NOT be observing them (definitely no direct looking at them)--you'll usually find their nests. They have very keen eyesight and seem to be especially attuned to YOUR body language and eye contact.
If you set up an area that is to their liking, they will use it. I've seen some made with cement blocks and others made as A-frames. They do like a place that has two exits, and it needs to be very camoflauged. I just let mine find their own nesting spots, as they usually nest within our two acres and fairly near their pen--the source of their major feed and water. When they start laying, they'll make a special "I've laid an egg" call, and will make a similar call when they're brooding and want someone to relieve them so they can go eat and drink. Once you get used to that call and the behavior of the rest of the flock, you can usually find their nests with a little time and patience. Their mates, and often the whole flock, are very supportive of their nesting and brooding efforts. After they start laying, if you observe them in the mornings when they leave their pen--being very careful to appear to NOT be observing them (definitely no direct looking at them)--you'll usually find their nests. They have very keen eyesight and seem to be especially attuned to YOUR body language and eye contact.