I have some chickens that I got from my neighbor. I have them 1-2 per cardboard box. They will be butchered tomorrow morning. Should I just leave them in the boxes overnight? I could make a makeshift pen for them within my chicken run, but I hate to just let them run with my other birds as I do not want them possibly exposing my other birds to diseases and mites, etc. Should I just leave them? Or is that cruel?