Can't tell chicks apart

[proudpiggyfarm]

Hi! I ordered blue azure and white rock x Cornish chicks from minor bros. When I picked them up, they were all in the same box . They all look the exact same. Since they are both white birds, they will continue to look the same...? How can I tell them apart as I have different plans for each breed and was hoping they'd be separate!

 

[IvysAnimals]

Do you have any pictures??

 

[proudpiggyfarm]

Do you have any pictures??

No. I can go take one, but even close up they all look exactly the same. I don't know why I hadn't though of this but someone had mentioned the white rocks will grow so much faster and in a week I'll be able to tell who's who!