Obviously there is a lucrative secondary market for authentic Vader artifacts. Its like the orderly from Silence of the Lambs who ended up selling Hannibal Lector memorabilia for big bucks on the black market (or just to Verger, whatever).
There I just spoiled the plot of the movie, sorry. Its a cross between smuggler chasing and a Raiders of the Lost Ark style search for supernatural power through Vader's old accoutrements. The good guys have to stop them and get that stuff in a museum where it belongs!