The Church “kept secret lists of part of the 30,000 people who are believed to have died.” (desaparecidos.org). One member of the junta, General Jorge Rafael Videla, confirmed in a 2010 interview that “he kept the country’s Catholic hierarchy informed about his regime’s policy of  ‘disappearing’ political opponents, and that Catholic leaders offered advice on how to ‘manage’ the policy.” (en.mercopress.com) 
Cardinal Bergoglio was called to testify twice about his conduct during the Dirty War. In both his testimonies, Bergoglio told the court he would make the Church’s records available. (counterpunch.org)
Pope Francis promised he would produce the documents mentioned in his 2010 and 2011 testimony, in April 2013 and April 2015.