What is the ruling on money acquired by imposing a percentage discount on goods from farmers without their full consent, and is it permissible to donate this money to an orphanage as a monthly allowance on behalf of the unknown owners of the money?

If money is taken unjustly or by force, it is obligatory to return it to its owners, or to seek their forgiveness, or to reconcile with them for a certain amount. If it is impossible to reach them or their heirs, it is permissible to give it away in charity on their behalf, while striving to estimate their right accurately.