How can the restaurant owner's right be restored, and is it permissible to appropriate it without informing him again of what is happening in the restaurant, in order to avoid problems?

The stolen money must be returned to the restaurant owner, who then has the choice of taking it back or forgiving the thief. If the thief is unable to return the money, he should ask for the owner's forgiveness. This is to clear one's conscience and avoid accountability on the Day of Judgment, when the good deeds of the oppressor will be taken and given to the oppressed, or the sins of the oppressed will be laid upon the oppressor. There is no need to inform the restaurant owner of the details of what happened if there is a fear of personal harm.