I was all ready to disagree with Ed, but he didn't respond...
IMO, a VoPo/RC Luger has a certain continuity of purpose to it. The Lugers collectors seek had a continuity that ended in 1945 (or 1919); VoPo/RC Lugers (and P-38's) continued in use until 19??. Whether they were carried by some lonely railroad guard on the Sino-Soviet border or languished in a warehouse somewhere, they were still continuing their history. We'll never really know what that history was.
I would value a VoPo/RC the same as I would any Luger. If all matching (original number match), then a premium for that condition. If force matched, on the high side for a shooter (because it probably has a new barrel). High side shooter to me is $850+; a matching 'premium' would be $1250+. That would be for DWM's; I would consider more for an Erfurt, Simson, or Krieghoff.
But I should point out, I am just Joe Crap the ragman; Bubba with a sticky bun in one hand at a gun show.