We lured ours back when they were lost by playing peacock calls through the laptop speakers (downloaded from youtube, amazingly enough) and by placing a mirror in the temporary pen we used to corral them. They can't resist reflections and will immediately approach a mirror. If you have a way to close the pen it works perfectly. We also use the cover drop (dropping a sheet over the bird) so that the bird can't see. But when you grab it, make the grab very firm (not squeezed-to-death) because they are much stronger than you think if you are used to chickens/ducks.
Ours were originally raised with treats from the cupcake baker in the neighborhood who shared discarded cakes with them. So, for a long time, all I needed to do was stroll out into the yard, loudly cooing "Mama's got CAKE!" and they'd scurry in.
You might also check around to see if anyone's posted a lost notice. We stuck them up at the feed & seed and the local equivalent of a 7-11 (The Blackwater Trading Post) and notified neighbors. Sure enough, peacock sightings abounded until we got them rounded up. "They are over here on top of the barn!" "They just crossed the road five miles down!" It was great how helpful everyone was. There is something magical about peacocks. They are sooo beautiful.
Good luck!
S.
