This great video presents a photo album containing pictures taken at Auschwitz-Birkenau. It says that it is the only witness to the fate of Jews who were sent to these kind of facilities. In fact, it is not exactly true. Other documents exist as well, such as punch cards and administrative sheets. See this earlier post for the commentary of Edwin Black, author of IBM and the Holocaust, in Mark Achbar’s film The Corporation. Check as well this blog post by Dave Emory on the subject.