http://www.mast.tas.gov.au/domino/mast/mastweb.nsf/v-lu-all/Publications~Incident+Investigations~Near+Miss+-+'Marana'+and+Seaplan+-+Apr+2002+/$FILE/Investigation%20-%20Marana%20&%20Seaplane%20VH-DRI%20-%2006-04-2002.pdf?OpenElement
Hidden away, but the above document discusses licences etc as far as MAST are concerned - IF there was an incident/accident, and the pilot didn't hold every required licence , then you know damn well what would happen ... respectfully saying the issue isn't policed is an ignorant comment.
"Certificate of Competency required to be held when in charge of a seaplane while it is operating on any Tasmanian waters. (This is in addition to the necessary flying qualifications which are required by the Civil Aviation Safety Authority)
A MAST issued 'Limited Coxswain' Certificate. (This is required in order to ensure that the pilot has a basic understanding of seamanship and the Collision Regulations)"
Saying that the pilot has a pilots licence should be enough, is like saying he doesn't need a drivers licence either.