EEs, Welsummers, SS, Brown Leghorns, Cornish etc. have the chipmunk coloring etc. Maybe they are EEs because they are fairly common. See link for baby chick identifier.
https://www.mypetchicken.com/about-chickens/chicken-pictures/baby-chick-pictures.aspx
That or confused young staff. The chipmunk coloring can be many breeds can’t tell till older. Definitely not a BA. The coloring is just like @cluchingheck who showed you a BA chick. Unfortunately an error.