lorenzo, for any of your .com.au's never trust the 25-30 day rule, i've found it is unreliable. i've let domains purposely drop and have been AMAZED at how quickly they end up listed on drops.
yes, you have a redemption period but i'd never let anything go more then 7 days, then once its registered you can do what you want once again.
COR can happen quite quickly in .com.au if all parties play a quick role in reply , so it may look almost instantaneous to the outsider. I've been able to achieve it within 1 hour.
you just need all your pieces lined up and its bang bang bang bang DONE.
the fastest way is to change the email notification address to yours, this way all correspondence comes to you, you just say YES to everything and at the end change it to the new owners address and hand it over + get them to check the whois..... done
tim