"All of them were fired...that was part of the proofing process, wasn't it?"
Yes, they were.
And that's also considered to be a given in the firearms community.
Unfired means not fired outside the factory.
"I don't think they have much value unless the gun is complete , that is with the Pederson device, bolt, magazine etc."
I wish I could say that $1,000 to $1,500 and up isn't much value...