Checking in an extra bag on a Sydney layover?

[Ecco]

I’m flying HTI-SYD-AKL later this week. I’m on an extended trip and stopped in Sydney before going to Hamilton Island for a couple of days for a wedding.
Does anyone know if I can put my suitcase in storage at Sydney airport and just take a carry on up to Hamilton Island. And then on the way back through Sydney on the 4 hour layover, go and get my suitcase from the Sydney airport storage and check it through for my Sydney to Auckland flight?

I did ring QF but I think the operator in the Phillipines didn’t know what I was asking. MY HTI-SYD-AKL flight is all on one booking.

 

[kiwitripper64]

I found this

Sydney Airport - Smartecarte

Sydney Airport Let Smarte Carte help you make your travels through Sydney International and Domestic Airport easy and stress-free with our convenient traveler services. Baggage Storage Smarte Carte Bag and Luggage Storage provide travelers with short-term and long-term storage solutions...

smartecarte.com

If you used this, could you still use QF transfer bus from domestic to international?