Assuming the mystery flight out of MEL is to LST, would it be fair to assume that despite the day commencing at 7am they will actually be using the scheduled 0830 service and returning on the 1655 service arriving 1800? These flights are available for booking now at the usual prices of $116 including via points at 8,000 (Not $737 etc). Business paid/points is not available on qf.com for this flight, so it’s possible this is just the usual service using a single class 717-200 all economy config and the mystery flight is indeed a 737 aircraft Operating a very different flight number etc. Strangely enough though, almost every other LST service other than on May 1st offers business class.
In the unlikely event that this is the same aircraft and flight, surely Qantas must have some sort of check in place to ensure people aren’t just guessing the flights, booking them in anticipation in an attempt to attract all the benefits stated for the ‘mystery flight’. If not, it could be a neat back door ticket, especially with full flexibility on points tix.