Turkey hens are VERY crafty. We have tons of coyotes, raccoons, skunks, etc and she evoided them all. Your pyrenees must have the nose of a bloodhound. Now my hen has been taking the poults to a different location every evening. My nightmare is that her poults will grow up feral and colonize the neighborhood. I don't care about the bronze one or the black ones, I can pretend like I don't know them. But if a bunch of blue slate turkeys start messing up people's yards, everyone will know where they came fromLol!! My turkey birth control method in my goat lot next year will be my Pyrenees. He finds all eggs within his territory and removes them for population control. He also doubles as quality assurance coordinator and inspects the eggs for freshness and taste. In short, he is an egg eater. The turkey hens will have to get pretty crafty to keep him from finding their eggs.
I plan on keeping birds I want to breed in separate pens during breeding season. We will also have to put nests up high where Waylon can't reach them, because he finds all eggs where he can get to them.
I'm glad your hen brings the poults back to the yard during the day. You could follow her late in the evening in stealth mode and see where she is taking them. By now I imagine she is taking them up in a tree.

It is my fault for not penning my birds properly. My hen doesn't like to be locked up, and I feel like a big meany if I don't let her do whatever she wants all the time. I am so bad at this lol