Sort of, we got Neil Kilkenny by chance in 2006 thanks to Stan Lazaridis and most of the boys we know of leave here mid-teens to have a crack at Europe (a few went to Sth America a few years ago but haven't heard much from there since), so we know who they are in essence.
Only real loss I would say has been Christian Vieri, who was raised here and maybe the Croatian boys of Simunic, Didiluca and Seric but besides that, we know of most players in the system as such.
Without being officially in the 'loop' someone else here may have a better answer for you.