If one's conscience found profiting from them troublesome, they should be donated to a museum, the Smithsonian if nothing else, or perhaps the Imperial War Museum, with an affidavit giving as much provenance as possible from the lady whose relative left them to her.
Personally I have no problem with demonstrating the triumph of Capitalism over National Socialism by flogging those babies for every damned dime that could be squeezed out of them, and if some nutcase wanted one for his Hitler shrine, that's X thousand dollars he doesn't have to spend on greater mischief.
So there.