Yes, cupcake, I was about to ask that very same question that Sue and Merlin are posing.

I have been concentrating online at NSW BDM looking for likely deaths for Jack J Steel and variations 1928 – 1931. So I have tried the wildcards for the surname "S ? ? ? ?" and "S ? ? ? ? ?" (? as substitute for each letter in the surname)
There’s very few choices.
Jack J SLABB #21241
Jack T J SMITH #8331
Jack H STONE #6200 (registered Redfern)
Jack SANCHO #4079 (also registered under the surname ABORIGINAL)
Jack SLOANE #16956
Jack W SPENCE #7587
Jack H SUITOR #5536
It is way outside of the square thinking, and likely way off track.
Cheers, JM