I guess you can also add the misidentified photos that are still being referenced.
The one that I always find on the top of my list would be Rodney Gerrard collection of fake fabric samples and documents. The one piece that come to mind would be the Voss report on his downed Trip.
I will also add 99.9% of the things on Ebay that are suppose to be from
Manfred von Richthofen the Red Baron. You can buy a strand of his hair in a small test tube with a certificate of authenticity. Wow, what a deal...
Lloyd...