OK, so I called the feed store where I purchased them from and asked for the name of the hatchery. They said it was Clearview Hatchery in PA. I called the guy at Clearview and he is insisting these chicks are RIRs....
Do you have an updated pic? My chicks look just like that, and I know they are sex-links (the breeder calls them Cinnamon Queens). Daddy was a RIR, Mama was either a Del or a SLW. The breeder got all kinds of babies-- from completely plain yellow or red to the full chipmunk-patterned yellow or red.
Here's one of mine:
They're feathering out patterned instead of plain red-- I'd love to know what they're going to look like!