Fewer than 20 of several thousand members of the Sonderkommandos are documented to have survived until liberation and to have testified about the events (although some sources claim more). Among them were Henryk (Tauber) Fuchsbrunner, Filip Müller, Daniel Behnnamias, Dario Gabbai, Morris Venezia, Shlomo Venezia, Antonio Boldrin, Alter Fajnzylberg, Samuel Willenberg, Abram Dragon, David Olère, Henryk Mandelbaum and Martin Gray. Another six or seven are confirmed to have survived, but they have not given witness (or at least, such testimony is not documented). Buried and hidden accounts by members of the "Sonderkommando" were later found at some camps.