If the First World War gave origin to the mass witnessing, the Holocaust has produced a corpus of memories which has no a comprehensive bibliography. The stories of the false witnesses, discussed in this work, fit in the context of the history of witness and, in particular, in the evolution of the Holocaust memory. The false survivors are the witnesses of a trauma that has penetrated the social discourse, after the Eichmann trial has inaugurated the “witness era” turning the genocide victims into the victims in excellence. The pressure of denial, which requires both the witness and the historical to provide the proofs, prevents, however, to evaluate the effectiveness of a simulation suggesting, inevitably, the issue of authenticity. Nevertheless, some scholars have welcomed the simulated memory as an alternative to the total lack of memory that may occur after the disappearance of the last true witnesses. Through this perspective, the false survivor Binjamin Wilkomirski, which, after all, does not propose a false memory, but a simulated memory, could be considered the meta-witness of our post-modern times, the one who has not seen directly but has received a vision. However, the risk of such an operation is that the Holocaust becomes a metaphor for what is outside of history and that false memories are no longer distinguishable from authentic witnesses. Of the various scenes of the genocide memory, I examined the current age of post-memory in which, in my view, the texts of false witnesses take their historical and literary dignity. The analysis, after an initial presentation of the three most complex cases of perjury, follows the reflection on memory developed in the United States and Canada. A critical review of sources, combined with the work of eminent scholars of the Holocaust, has made possible to understand the role of historiography and literary topos of the Holocaust in the construction of collective memory, deepening further the relationship between narrative, authority and truth.