They came back, bright & early the next morning. The peahens hung out with the chickens, and were even woo'd by Peeper the beta roo (who was chased off by Lucky, the alpha roo - guess the roos think the peahens are really big female chickens).
I still don't know where they go off to at night to sleep, but they've got 8 acres to roam and plenty of trees to perch upon, so it could be just about anywhere.
[Euterpe on the porch railing. They were munching on the dog food earlier. Yep, definitely part of the flock now. All the birds love the dog food. ]