It is not that tough.
1. Measure the perimeter of the current old style coop that you have been using.
2. Go to the nearest feed store and purchase one 50 lb sack of cracked corn fo every 100 linear feet of fence perimeter.
3. Step back three paces, approximately 10 feet from the current fencline, and with a slit sack of corn start circling the perimeter. Open the rest of the bags until you have a thick line of corn outside, surrounding the current fence.
4. Get a good stront pair of tinner snips, well oiled, and start clipping the current chicken wire, close to the posts.
5. With one or two friends, using chain saws, cut the wooden fence posts as close to the ground as possible. If you have metal posts, working from the back of a pickup, using an 8 pound mallet, smack the sides of the posts until they loosen, and then have friends dig them out.
6. Okay, now start dancing and shouting, or paying Alicia Keyes; last horrible CD as loud as you can, until all the chickens escape.
Okay, this is the great park, over the next few months asks neighbors to be on the lookout, or round up one or two at a time, and advertise :ORANGIC FREE RANGING CHICKENS.
Quadruple the price for the chickens you sell and laugh at the stupid customers.
You are welcome. Glad I could help.