I think it is more likely A. falciformis because leaf tips were blunt/rounded, didn't have any scent when torn, and bark crenulated/rough rather than deeply furrowed/fissured - it fits with description and range map extremity in my 2009 Edition (2011 reprint) of Costermans "Native Trees and Shrubs of SE Australia". See also confirmed A. falciformis sightings Acacia falciformis (Broad-leaved Hickory) and https://canberra.naturemapr.org/sightings/3395271. It also occurs in a bushland setting and location where E. sideroxylon would be highly unlikely to occur, especially as I have never noticed any plantings of it in this part of the Monaro. I just checked a larger mature planted E. sideroxylon street tree where I live - it has longer more slender leaves and most notably the leaves had a weak Eucalyptus scent when torn and leaf tips are sharp/pointed.