I just picked them up today. The lfs was selling them as large C. julii (what else?)
They are mature fish, a little shaky from being shipped, and nervous as can be, but otherwise seem to be healthy. I did ask if anyone knew where they were imported from, but no one there at the time knew. However, that lfs usually gets most of their corys from Brazil. I don't know if it will help, but in the same tank were two smaller corys that had similar markings but more rounded noses. Coryologist, please help me identify them.
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Coryologist is the best one at this. 
That narrows it down. I'll try to get a better look at them tomorrow. Right now I'm letting them rest.