Ayam Cemani mixes gender?

[AzysCreations]

I am a bit perplexed with this one they are all about 10-12 weeks old. I think one is a roo.. they are australorp Cemani mix.
Anyone know a trick for sexing Cemani mix chicks? I have a bunch and I constantly struggle.
All of these kiddos have the same leg thickness.

 

[cherrynberry]

They all look like pullets

 

[AzysCreations]

Pardon their little mess they just ate eggs lol.

 

[AzysCreations]

They all look like pullets

Thanks! I was certainly hoping so. I had a slight hunch, thank you again!

 

[gimmie birdies]

I thought I would put up my AC/austra white mix...

 

[TheOddOneOut]

girls

 

[Yard Farmer]

I personally think 2 is a boy...
Could be wrong.