DUH! Somehow I missed the part about the 8th. I'm getting a little spacey in my "middle ages" (as my kids like to say).
YES - I'd give the breeder a call and ask what's up. The eggs should be hatched by now and it's about the right time for the breeder to be pulling the babies for handfeeding (if that's what your breeder does).
EDIT: In reareading (closely rereading) your original post, I noticed that you said the breeder *thought* the birds had been sitting the eggs for two weeks on the eighth? She didn't know for sure? And this breeder is still allowing the same birds to sit the same eggs 23 days later? for a total brood of 37 days? That's highly concerning to me - to the point where I'd suggest you begin looking for another breeder. Allowing birds to brood a clutch that long is at best an amateur mistake, and at worst the sign of a poorly educated breeder or a poorly maintained breeding program. Brooding a clutch of eggs is very hard on the parents of the clutch of eggs under the best of circumstances, and that's when they hatch right on time. Allowing a hen to sit a clutch almost twice as long as is normal, to me borders on neglect.
Yes, I tend to be a bit harsh, especially not knowing all of the details, but I love birds dearly and hate the idea of seeing any of them mistreated in any way.