Mapping boxes in a storage bay is provided, which includes: ascertaining storage bay boundaries; wirelessly reading, using a mobile device, identifying information from tags associated with the boxes, each box having one or more associated tags, and the identifying information including size information for the associated box; determining position of the tags in the storage bay by triangulating tag locations relative to, in part, one or more locations of the mobile device; and creating, by a processor, a mapping of boxes in the storage bay using the tag positions and the identifying information wirelessly read from the tags. In one or more implementations, the tags are near-field communication (NFC) tags associated with the boxes, and the creating may include automatically reorienting a floating box in the mapping of boxes, as well as automatically repositioning a box when boxes overlap each other, or overlap an edge of the storage bay.