Since the Power of Attorney is a legal document it should always be stored in a safe place. In addition, copies should be given to the person you have appointed as attorney and your Perth family lawyers. If the appointed attorney is going to deal with real estate in NSW on your behalf, the document should be registered with the Land and Property Information Division of the NSW Department of Lands. This is the only requirement for the document to be registered. When and if you revoke the Power of Attorney document, the cancellation should also be registered.
Why witnesses are needed
When you create a Power of Attorney there has to be witnesses that sign the document. These witnesses are meant to ensure that you understand what you are doing and believe that the person you appoint is capable of acting in your best interests. This prevents older people being manipulated into giving unscrupulous family members legal right to administer their estate to their own benefit.