Hmm... many breeds can not be sexed by 6 weeks by looks, especially to someone who is inexperienced or unfamiliar with a particular breed. (as you describe this person) What is cfm?
He probably still needs to get his kinks worked out.... It is a learning process that never ends. But no Ameraucana will have a straight comb if it's pure breed.
And the dark one doesn't appear to have a beard or muffs. So neither of yours are Ameraucana.... though they MIGHT have some mix in there.
I'm not saying they intend to deceive you. They just need to familiarize themselves a little more if they can't see beards or muffs and still call them Ameraucana. Also, some people who get theirs at the feed store will never even realize there is a difference.
And some boys will be late bloomers showing no signs of boy and suddenly change one day two weeks after you had everybody separated out.
Ask me how I know!
Anyways... I don't mean to be discouraging. People make mistakes as they learn (seller). Hopefully your birds will still be great and healthy! And maybe he will trade with you or work with you in the future to get what you really want. My flock is around 50... and no matter what breed they are all individuals and lay when they are good and ready (not when their standard says). Some of my barnyard mixes are actually my favorite girls, just not what I had in mind when I paid the price for a rare, pure breed....
I hope you still enjoy them!