Its so sad !!!
The idea about the postal carrier and school bus driver is a good one. Especially if you are rural, they know everybody's business.
I have latches on my coop and run that are meant to have a padlock put on it but because of the ice I don't do it. Sometimes I have trouble just getting it to unclasp in the cold weather so I can get in.
I belong to a gardening forum and ppl report quite frequently they will come home to find someone has actually been in their yard and dug up their plants/trees/shrubs. And every time I see that kind of post I think what kind of freak job does stuff like that.
It had to be someone local to know your routine and when it would be safe. How that person could look at your chickens and enjoy them is beyond me.
I'm so sorry.
Julie