In this section, “fiduciary” includes the fiduciary’s successor. Except as provided in subsection (c) of this section, if a safe-deposit company rents a safe-deposit box to a fiduciary, the safe-deposit company may not permit access to the safe-deposit box: By any person other than the fiduciary; and If the safe-deposit box is rented to two or more fiduciaries, by less than all of the fiduciaries in person. The safe-deposit company may permit access to the safe-deposit box by: Any individual authorized by all of the fiduciaries, in accordance with a rental agreement, written power of attorney, or other written authority signed by each fiduciary and filed with the safe-deposit company; and Less than all of the fiduciaries, in accordance with a rental agreement, written power of attorney, or other written authority signed by the remaining fiduciaries and filed with the safe-deposit company.