Be careful there !
I did this years ago, and when I went to the feed store to pick up my pre-paid order.ALL of my babies had been sold to customers.
Seems when the big boxes of chicks arrives, they all get put in big galvinized tubs, and anyone can buy any of them, due to the fact that there is ALOT of employees, and they do NOT know which chick is what. If one person knows you have a special order, no guarrantee the rest of the employees know that.
Most of them cannot tell one breed from another unless the box specifically says "White Leghorns" on the box.
If the box has several breeds in it, they have no clue which are which. They never pick out the special orders and hold them in their own heated tub.
So best be there on the very day, the very minute that chick order comes in.
Hope they don't sell your babies to someone else !