I think you need to ask someone to help you with getting your items posted out.  I don't think you can even do registered post any more.

Are you drop shipping and someone else has the goods?  Your feedback percentage is not good.

Please remove this from your listings as it is just wrong and it won't protect you.

If you select Regular Post YOU must contact Australia Post asap is your item does NOT arrive! We DO NOT work for Australia Post we have NO control over mail once shipped! We cannot locate any missing items! 

DO NOT LEAVE US NEGATIVE FEEDBACK FOR AUSTRALIA POSTS FAILURE TO DELIVER IF YOU CHOOSE REGULAR POST