A member of a private security patrol was assigned to guard a store that had been partially burned in a blaze of suspicious origin. He had keys to the store and was supposed to check both the inside and outside. During the night, the guard entered the store, took a couple of transistor radios, and put them in his car. The owner of the store discovered the loss shortly after the guard completed his tour of duty. The guard could be properly charged with what crime(s), if any, and why?