Systems and methods are described for detecting theft events based on a dynamically updating high-shrink electronic item library. In various aspects, a server is associated with an onsite venue containing several items. The server is in communication with an electronic item library, where the server dynamically updates the electronic item library based on theft events associated with items of the onsite venue. The server further associates one or more shrink categories of the electronic item library with the items, where one of the shrink categories may be a high-shrink category. Detector station(s), located within the onsite venue, are configured to track a high-shrink item within the onsite venue, where the high-shrink item belongs to a high-shrink category of the electronic item library.