Hong Kong Customs has implemented a combined RFID and container locking system to ensure the integrity of cargo containers at two of its customs houses. Combining the RFID and locking system allows customs officials to track not only the location of containers, but to remotely track, allow or prevent the opening and closing of the container. When a container is transported from the customhouse to the airport, the receiving officials are able to see that it has not been opened en route.
Customs officials also estimate that the new system cuts the time needed to clear containers through customs from 2-3 hours to 5 minutes per container. Quite a significant increase in efficiency.
Full text of the article may be found here: http://www.rfidjournal.com/article/view/9490/3