<p>A lock mechanism for sealing a goods compartment has a housing (10) supporting a shackle (62) movable between open and closed positions to permit hoops on the ends of an elongate sealing member (44) to be connected thereto and then held thereby. The shackle (62) is retained in its closed position by a spying loaded push-button (32) and also by an auxiliary lock (64) including an electric actuator (71) controlled by a control unit (15). The housing (10) has a display device (17,18,19) to indicate the lacking condition and sealing of the mechanism and also has a proximity card reader adapted to read information from a presented smartcard, operation of the auxiliary lock (64) being controlled by presentation of an appropriate smartcard.</p>
