A portable safe for assembly with an apertured member includes a safe housing and a safe door. The safe housing has an internal cavity extending to an access port, and at least one opening configured to align with at least one aperture of the apertured member. The safe door is securable to the housing to substantially block the access port. The safe door includes a locking mechanism having at least one locking member secured in a housing engaging position when the locking mechanism is in a locked condition. The at least one locking member is movable to a housing disengaging position when the locking mechanism is in an unlocked condition. The safe door further includes a lock interface that is selectively operable to move the locking mechanism from the locked condition to the unlocked condition.