What is the ruling on taking a sum of money without the owner's knowledge as compensation for unpaid overtime, knowing that there are other sums (tips) that have not been paid by the manager? And is one absolved of responsibility by returning the money to its owner without ensuring its receipt?

He who has taken the right of another must repent and return it to its owner. If the owner has died, it must be returned to his heirs. One's responsibility is not discharged until it is confirmed that the right has reached its rightful owners. If you doubt that the money you sent has arrived, you must resend it by a means that guarantees its delivery, such as shipping companies that confirm receipt or return the shipment to the sender if it does not reach. In this regard, the story is told of the righteous man from the Children of Israel who returned a trust by throwing a piece of wood into the sea after he despaired of finding a ship, and it reached its owner by the power of Allah.