Is taking a bag found in a store considered stealing, and should it be returned to its owner or to the store, and what should the person who found it do to feel at ease and for God to forgive him?

For repentance to be accepted after taking money that does not belong to you, the money must be returned to its original place and its owner sought. If she cannot be found after diligent search and effort, the money should be given as charity on her behalf. If her owner is found later, she is given the choice between affirming the charity or reclaiming her money, and the person who took the money will receive the reward for the charity.