Abstract: An object tracking system for automatically tracking a plurality of objects such as keys includes a plurality of tags each associated with an object to be tracked, and each having a depending tongue with opposed side faces. A touch memory device storing a unique ID code is attached to the tongue of each tag protrudes from one side face of its tag a distance greater than from the other side face. A storage unit for receiving and storing the tags has a plurality of slots each asymmetrically profiled with a bulge along one side to allow the tongue and touch memory device of one of the tags to pass through in one orientation of the tag but to prevent them to pass through in other orientations. A sensor is associated with each clot for engaging the touch memory device of the tongue of a tag inserted through the slot and a computer controller is coupled to the sensors for reading the ID codes of the touch memory devices to determine the presence and absence of tags and their objects in the container.