I am in Georgia near Atlanta. This is happening during the night. I have just come in from looking at the pen again. It is about 60' x 30' with divided sections. The intersections has chicken wire with tight fitting doors leading from one to the other. I did find a void on two outside doors...
We have a chicken pen covered with chain link fence 6' high and chicken wire inside of that and across the top. The doors fit tight and can not see how anything is getting in. We first found a chicken that was sitting on four eggs dead still sitting in the nest and the eggs were totally gone...