Is it amongst all those other strange collection of exotic wattles on Isaacs Ridge? This is a rare species in the ACT known from Aranda Bushland, Black Mountain and the northern end of Mt Majura (near the junction of the Federal Highway and Majura Parkway. So this would be (is) a fourth location.
I wouldn't have picked from the description in'Flora of the ACT' but it was shortlisted when I tried Lucid Wattle key. Perhaps with all the other stray wattles it is not the local variety but I can't tell.
The curly hairy pods are very distinctive as a failsafe Id, but I'm pretty happy with the ID, perhaps best viewed as a woodland establishment of a regionally rare species