AP lodgement form on web is

http:\www.auspost.com.au/media/documents/registered-post-lodgement-receipt.pdf

Whilst the form was designed for only a select few products, the lodgement form does not exclude use of the form with other types of postal articles it can serve other purposes. I just write in type of service being used at the top or amend tick boxes accordingly - haven't had a problem with a PO yet, when I have been asked, I truthfully indicate I need it for my business mail register.

I attach the tracking label - present when lodging pre-paid product parcel, own parcels, registered large letters etc, post office stamps  and voila - all you need to confirm address details, tracking details and post office date stamped to prove lodgement. 

If anyone strikes an AP rep that won't accept AP lodgement form for other articles, I would suggest designing your own using the AP one as a guide, and present that for stamping as a document that forms part of your mail register.

Using lodgement forms or self designed mail registers that are stamped at lodgement also saves having to try and match PO print-out receipts with addressee details after lodgement.