I finally got fed up, one pellet gun, 4 bodies in two days. They were stealing chicken feed, destroying my garden. (lost 8 tomatoes in one day) and I think they got an egg or two. 
After two days of 'hunting' I have not seen a single one today. I thought I would feel bad, I don't generally like killing, but they were stealing the food out of my mouth. 
The fence around my garden is chicken wire topped with electric (7 strands over a two foot span) 
I knew when the hens started really making a ruckus, and there it was in the coop right by the nest box, it was past time to take action. 
Good luck.