I recently bought 7 chicks. 5 Pure Bred Australorps and 2 Auracanna/Australorp crosses. I've been looking up how to sex them but it's not really working out.
Too young right now, you can try at 6-8 weeks. You may have to wait 12 weeks or more on the Australrops. Mine are 7 almost 8 weeks and there are a couple that could still go either way.