An inventory system can include radio frequency identification (RFID) tags and RFID tuners that can be brought into interacting proximity with one another to provide input or other information about the location or other condition of movable elements within the inventory system. For example, interactions of RFID tags and RFID tuners at different locations within an inventory system may be utilized to associate a container or other movable object with particular receiving surfaces at particular points in time to facilitate identification of the whereabouts of the container or other movable object.