So how long can we use pre-paid registered labels on parcels I wonder ??   Can we get a refund on return ??   Or will they just float around in the system, in the pool of now defunct Australia Post products that have no expiry date ??

my guess it they will float around with the other defunct products such as pre stamped 20c envelopes, aerogrammes, prepaid International Postcards, lettercards and the rest!