Gazetted is a term borrowed from the British Government by some, perhaps many, former colonies. There is a weekly paper called "The London Gazette" which, at the bottom says "Published by Authority" - which I've always thought was a fantastic expression. The London Gazette is the organ by which certain Government actions are made real in a sense. For example, appointments to the Privy Council, senior military appointments, schools inspectors' appointments are announced in it; so are bankruptcies - the doctrine being that ignorance is no excuse and creditors ought to read the London Gazette just in case they find out that someone who owes them money has gone bust. The Royal diary for the week is set out in it, if I recall aright. And also the sort of thing that the scam letter talks about.
But no one reads the London Gazette except Government officials. There is nothing in the paper except these announcements. And the paper, I should think, makes a profit, because each announcement is charged for like an advert.
MG