Please help! Eggs theft In Poultry, what is the way out?

I write on behalf of my aunt who’s on the verge of shutting down her farm due to eggs theft by her workers. The more she put in checks, the more the workers devise new means. I promise to provide advisory to her on a lasting solution. Farmlanders please proffer workable solutions to save a business on the verge of collapse.
Concerned Farmer