The point here is not to question the veracity of your story or the authenticity of your daggers, for which you have a provenance satisfactory to yourself.
The point is that value depends on being able to establish authenticity for people who didn't know your uncle. DWalt‘s point that the market is flooded with reproductions (not necessarily intended to be “fakes”), many of them high-quality post-war German production, does make it necessary that you familiarize yourself with the details.
A couple appear to be military dress daggers. Take a look at this article:
German Army Dress Daggers
I looked at a Walther P1 a guy was selling. He didn't know the difference between a P.38 and P1. Given his distress when I made the distinction and the implications, I am fairly certain that he did however genuinely believe it was a WWII bring back like his father said it was.
His father may well have brought a P.38 back, then later sold it, regretted it and bought a P1 to replace it for nostalgia, and attached the bring back story to it.
*IF* it had been a P.38 it would not have been possible to disabuse him of the notion that it was a bring back. But from a value/collector standpoint no one pays for a story, and unless there is authentication in the form of bring back paperwork it's just a story.
I've encountered similar situations with alleged bringback SKS rifles, and the rifle in question was well worn and abused enough that it could have conceivably been legitimate. GIs were allowed to bring back the semi-auto SKS, although how many actually made it back in the original GI's hands is open to question.
On the other hand, there were also a LOT of well used and abused SKS that were imported before import marks were required and the odds were much greater that it was one of those worth about 25% of what the seller was asking. Without paperwork to authenticate the story, it's just a story.
In any case, that authentication hurdle is what you'll have to jump over if you are considering selling and want full value. At a minimum you'll need to have them authenticated by a recognized expert. It won't be fool proof, but it will go along way toward satisfying the buyer they are the genuine articles.