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Short notice fares shown in HKG$ released every Tuesday at 10am Qld time.
Sample HKG/BOS/HKG converted to AUD$725 approx (inc surcharge) for May 2015.
HERE.
not sure of your calculation.
I'm getting base fare of HKD3990 + carrier surcharge of HKD712 plus tax of HKD612, for a total of AUD881.
(still about a AUD250 saving over other airlines for that time)