Good Morning. As you said, your white/mixed birds cant be feather sexed.... You'll have to figure them out as they crow or lay eggs.... But the two others could be feather sexed with a good pic of the breast/belly area...... I believe at least one of those to be a hen. But cant be sure with the pix provided....
Thanks I got two eggs so far today so I am assuming I have at least 2 Hens in the group. I know I have one roo for sure (one of the white ones) because he likes to charge and attack anything that goes into 'his' cage and calls non-stop when someone enters the bird room lol