Is it sufficient to give charity equal to the value of cassette tapes taken from a school's prayer room – it is unknown whether they belong to someone or were placed there for distribution – with the intention of absolving oneself, given that it is difficult to return them or identify their owner?

If the tapes were made available for borrowing, they must be returned to the mosque as long as the institute's address is known. However, if there is no indication that their purpose is limited to lending, then it is better to benefit from them first and then lend them to someone who can benefit from them.