I have noticed that each breed I have ordered straight pullets, all the chicks had chipmunk stripes in the breeds colors. That does look like my EE chicks.
brown leghorns, silver phoenix, gold phoenix, dark cornish, EE's, salmon falorelles, some game bantams, wellsummers, gold onagadri, silveo onagadori, some sex links.....
well, lots and lots of breeds. the list goes on. usually in order to identify a breed with chipmunk stripes we would need a picture or two