The actual boundary comes just to the south of Mudgee to 45DME SY (nearest waypoint there is BOYSY). Anything to the north of 45DME SY is YBBB (the Brisbane FIR). If you want an actual waypoint that is the start of the YBBB FIR on the east coast, then it's TOOKI (S33 16.1 E151 33.8).
Hope that helps.
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