Mystery gray and yellow chick - Help ID?

[WindyRoost]

Hello! We just picked up these little ones last week, so they hatched about 4 or 5 days ago. The two with the chipmunk stripes should be easter egger, but we're not sure about the gray. The primary feathers came in white, but the new ones are light gray.
The breeds on offer at the time were supposedly easter egger, production red, golden comet, and Russian orloff. She doesn't look like any of them! Any ideas?

Hi! How is your mystery chick feathering in? I have my own mystery chicks that I think are Americana/EE. Id love to see possible grown feathering, if you have photos.

 

[MapleKehDucks]

Hello, did you ever figure out the breed of your chicken? I got some mystery chicks that looked almost identical to your original picture. Very curious.