I can't believe what some people are capable of doing. I'm so sorry.
Several years ago we were hit by Hurricane Floyd and someone broke into my barn during the storm and stole 2 ewes and 2 lambs. A few days before that two men stopped to ask if I had any lambs for sale. I told them I did not, but didn't think to get their LP even thought they were kind of skeezy. I'm sure that's who stole my sheep. Now I get the plate number of every vehicle that stops and asks about eggs, birds, sheep, goats or dogs (I have a kennel). It really stinks that we have to be suspicious of people who simply may be curious or want information. I guess that's just the way it is.
I also had a friend who had a dog stolen from a dog show. She finally got it back weeks later because we all were tenacious about getting flyers with the dog's info and photo plastered all over the area. If they came down, we put them back up. We worked in shifts, so that the area was "patroled" by someone every couple of days. The guy who returned the dog said he found him, but he had obviously been taken inside because he still smelled of grooming spray.
Be really diligent about keeping posters up. If you have pics of your chickens put them on the poster because pictures will catch people's attention more that a flyer with all words. Also, contact all the shelters in your area and in surrounding areas, just in case someone decides all the publicity is too much to handle. That's what we think happened with my friend's dog and why she got him back. Good luck.