How old is your child? Is this the first time he has done something like this or does he often bring home things that don’t belong to him? Do not scream at your child for having told you the truth. If you do that, you will be closing the lines of communication between your child and yourself. Instead, ask your child why he did that? If he wants something let him know that he must first come and ask you for it. Ask your child to go and return the thing that he has stolen. That will make him feel terrible and may make them resent you for making them go through the experience. But it will surely make them understand that stealing has consequences. At this life stage, you are imposing a penalty but later the penalty may be legal and far more difficult to endure.