Im sorry you ahve to give them away. I know your pain. Of the 20 eggs I incubated, 8 hatched and 5 of those are boys I have to give mine away in 2 weeks when they are 8 weeks old too.
They all look like roos to me. The combs are too red. Pullets wont get that red until they are closer to 16-20 weeks and are ready to lay. Your aussie bird looks like a roo, my girls didnt get wattle growth until well into 12+ weeks.