A sealing system for sealing a container lid to a container body includes at least three tags adapted to be mounted to the container lid or the container body, each tag having a unique ID and a first RF transceiver configured to transmit a first RF signal. The system includes at least three anchors adapted to be mounted to the other of the container lid and the container body, each anchor having a unique ID and a second RF transceiver configured to receive the first RF signals. A master unit is adapted to (i) determine, associated with the ID for each tag, a respective current 3D position, based on the first RF signals, (ii) store previously determined 3D positions for each tag, and (iii) generate an alert, timestamp and/or a log entry if separation between the current 3D position and a respective previously determined 3D position exceeds a threshold.