A method and a device for secure verification of opening of a safe door of a safe, in particular a safe door of a safe of an automated teller machine, includes a safe door and storage compartments for cash boxes that are arranged relative to each other such that the cash boxes can only be removed from and inserted into the storage compartments when the safe door is open. A control unit verifies an opening of the safe door by checking if cash boxes have been removed from the safe and have been inserted into the safe in swapped order compared to a first operating state.