Presumably their owner has a nice terrarium set up and has given you an ample supply of mealworms, or other live food. If the terrarium offers hiding places for the little guy, then all is well. (They really like to hide.)

They are mighty hard to catch when they get loose because they are able to move quite quickly. Skinks can also get into small crevaces where you wouldn't be able to get to. In short, don't let it get loose.