Australian dated notes confirmed

I’ve recently received scans of polymer notes from Australia which differ from the regular issues in that these actually bear full dates overprinted on the notes, rather than just having serial numbers which start with the trailing two digits of the year.

I assume these dates correspond to the dates of introduction for each of these denominations and that the notes were issued as numismatic products, perhaps in a folder or as part of a matched serial number set. Does anyone have any additional information on these notes? If they were in fact issued in folders, please send scans of the folders, inside and out.