A good friend of mine, who emigrated from Russia a few years ago and dealt in Russian militaria, told me that a large movie studio in Russia has been making very good replica Cossak sabers for a number of years, and a few years ago they started hitting the US market, priced well under the usual price for a cossak saber.
As far as other Third Reich swords are concerned, I think the main threat is fake etchings which I have been told are starting to be more of a problem with the price of etched and presentation blades getting as high as they are. The postwar navy saber is always a potential problem also. Solingen made a lot of very high quality swords after the war, and there is no reason to believe that some of them havent been turned into Third Reich pieces. JOe S