There is a reality
Dead men tell no tales and its very difficult to tell the story of the holocaust from most jews because they were killed.
Obviously the most famous holocaust tale is Anne Frank, but that took place before the camps.
Even the story of the Warsaw Ghetto, There were very few survivors of the Warsaw Ghetto (Less than 1000), They put their archives in Milk Cans for retrieval. They found 2 of the cans, but the third was never found.
There are 12 known pictures of Treblinka and One Photographic log of Auschwitz (Some Nazi took photos of one transport and thats the only one that survived)