There is a lot of evidence located in the International Tracing Service archives at Bad Arolsen.
16 miles of shelves holding the stories of 17 million victims – not only Jews, but slave laborers, political prisoners and homosexuals.
This archive has been kept secret, and not opened to historians since the war. It has only been opened in the past year or so.

It might take time, but all the undeniable evidence for the holocaust is there, and will be revealed in detail.
60 Minutes did a fantastic show on this.