Person I know of works at an office building and was bringing a couple dozen eggs to work a week for another employee. The eggs were getting placed in a common fridge in a lunch room and were frequently dissappearing. Security was not much help as it was said to be a staff problem not related to company affairs or property. Idea was hatched to plant a dozen eggs that had visited an incubator for a bit but may not have been developing well. Sure enough they went missing and it was the last dozen to go missing. So cruel but so effective.