I actually could not catch them all, even at night. When I come in with a light, all I have to do is open the door and they start getting down off the perches and going to the corners.
I also don't have any fresh bedding right now, so I'm stuck leaving the old stuff in.
This chicken came this way off the truck, and I checked the few I caught and there is no sign of infestation. Of course, I know that bugs like this spread easily, so I'm hoping that adding powder to their dust hole will effectively dust them all for me. Plus the sick chick did get a very good coating - i only caught the poor thing because she cant run very well... I'll be sure to keep the bug powders fresh in the dust hole every day or 2 for a while.
If I can get a hold of new bedding, I'll change it all out.
Thanks so much for your help and encouragement!