I just read your other thread, and commented on maybe the neighbor boy is taking your eggs.
I've read that music improves egg production. Why not, music is therapeutic in so many ways for many species. I should put a radio in my coop.
But I doubt that a radio will scare the kid away. He'll just watch and come over when he knows you aren't out there. He'll hear music and realize the hens have a radio.
Big padlock! Maybe even threat of calling the police if he keeps trespassing. Can you get hold of a security video cam, set it up where he won't see it? Then you'll have evidence, if you do have to call the cops.
I hate thieves. We had some of that around here a few years back, lost a lot of tools out of our barn before we discovered we were being robbed.