All I got was a red x for Herman's pic. The new cory is a panda. From your discription Herman does sound like a metae. I've had them, very nice corys & should be less expensive than pandas. Seems like they get a little bigger than pandas too.
For your other corys you may get a better idea of their 2 species after they settle in a couple weeks, they look a bit faded. It's hard to tell exact species, there are many with that basic coloration: mask, dark dorsal area & body spots, without knowing where they were originally found. Lots of individual variations too. I agree they don't look like julii to me, cute though. Julii don't have a mask & the dorsal fin spot is away from the body.