I have a morring in Sydney and for a veriety of reasons my boat was away from it for about three months when i recieved a call from the MSB asking when they could expect me to return my boat to the mooring, i told the lady that i would return in a week or two, but time slipped by and i hadnt returned , then i recieved a email from the same lady telling me that i had vacated the mooring for an extended period of time and was about to be removed as the current mooring holder unless i returned within a given time. The next weekend i went to put my boat back on the mooring only to find that the mooring bouy was gone, supposidly run over by a passing speeed boat etc etc, so i had to then find somewere to leave my boat while i organised a diver to find the actual mooring block and rety a new rope and then purchase and attach a replacemet bouy, and since then all has been great, but the message is that you should tell the MSB if you are going to be off your mooring for an extended time ie over 3 months..
Happy sailing.
Ben 405