Dick, welcome to the forum!
I would probably seek a second opinion as to originality before selling these Lugers at a substantial loss. Too many fine Lugers HAVE been refinished (or "restored"), but even experts can make mistakes -- or disagree on an evaluation.
You should ask Dave at Simpsons what clues indicated to him that the guns had been refinished. And then, you should speak to the dealer who sold them to you, and give him Dave's evaluation. Many reputable dealers will back up their claims of originality.
Also, if these are indeed all-matching and in nice condition, they are among the most desirable of the shooter class (as opposed to collector-level) Lugers, even refinished. All-matching guns often function better than mismatched guns. It's difficult to say without seeing them, but even as refinished shooters I would think you could fairly sell them for something more than $400-$500. For instance, if the Black Widow grips are authentic and in excellent shape, they are worth more than $100 by themselves.
Like so many aspects of the firearms hobby, if you want to maximize your return on your investment -- or, in this case, recoup as much as possible -- you have to do the research, via books or by showing the Lugers to the experts.
FWIW, I'm also an NFA collector, as are several other forum members. I believe the mechanical aspects of machine guns have a lot in common with Lugers, sharing some fascinating solutions to technical challenges. And while Lugers are not appreciating as quickly as Class 3 guns, they are still rising in value faster than most firearms. If these are indeed refinished shooters, you might want to just hold onto them and enjoy them at the range without fear of breaking a part.
Good luck!
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