All high profile people's items are suspect. to much money to be made by fakes.
the one story was a vet. found hitler's uniform and while still in germany had a tailor make up more WITH the hitler tailor tags . Then sold / traded these to other vets who took them home.

plus a man back in the 60s/ 70s was making painting of the famous artists & sold them as originals. most ended up in museums world wide. then he got busted on something else. he came clean on all of his fakes he had made. The museums actually claimed he was full of it. they did not want to admit they bought junk & paid tons of money for.
SO , who could not fake these. Don't know who would.

Remember the fake hitler diaries ,back in the 1980s !!!
might want a painting of uncle adolf ,but his parents ??