The unknown B737 would have been the TOLL Priotity B737-300F, that operates a Monday-Thursday ADL-SYD-MEL-ADL flight.
And as Cam said the MH B772 gets towed around there on Monday, Thursday and Saturday's.
The QF B738's were possibly not required for the day and sit there until needed. QF do that alot on the weekends. Usually they park the DHC8-400 there on the days it does not go to Melbourne. On those days there is no flight between 1000 until around 1500.
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