Feather sexing 2 week old chicks?

[SelfSufficientMe]

Is two weeks too late to feather sex chicks? This is my first go around with it. I’ve previously purchased already sexed pullets. Never dealt with cockerels. The photos are labeled 1-7. I’m having a hard time following the two layer rule on the interior feathers. I could be misinformed. Any help appreciated. Thanks. I may keep two or three and I want to make sure they’ll be hens. I tried using the tail feathers but they all have about the same sized tail feathers.

 

[TheOddOneOut]

If they’re not a specific cross bred for it it does not work. And even if it would they’re too old.

 

[SelfSufficientMe]

If they’re not a specific cross bred for it it does not work. And even if it would they’re too old.

Ok. Thanks. These are unknown mixed breed chicks. Eggs aren’t from my purebred hens and I have no roosters. Found eggs.