Diaries belonging to Italian Fascist dictator Benito Mussolini along with correspondence he wrote and received before he capture and execution in 1945, are hidden somewhere in the Spluga Valley near the Swiss border, according to the son of the man who put them there. In an interview with ANSA on Thursday, Rocco Della Morte - the son of Guglielmo Della Morte, a wartime Italian consul in Berlin - said that in April 1945 his father met in Milan with Mussolini who gave him a locked suitcase, filled with what he believed to be documents. He was then told by Il Duce that it should not be opened until 2025. Mussolini then left Milan in an attempt to flee to Switzerland but his and his lover Claretta Petacci were caught and executed by partisans in Dongo, on Lake Como. Della Morte, who died 1961, joined the Fascist movement in the 1920s and embarked on a diplomatic career which saw him hold a number of posts in Germany. He eventually became consul general in Berlin and the Fascist Party secretary there. He left Germany after Italy surrendered in September 1943 and returned to a family home in the Spluga Vally town of Campodolcino. In April 1945, the son said, Della Morte was "summoned" to Milan by Il Duce where he was given a suitcase monogrammed with the initials B.M. and closed with a padlock. His father assumed the case either held important documents and correspondence with which Mussolini hoped to negotiate his surrender with the Allies or copies of his diaries and other important papers. Given the request that the case not be opened for 80 years, he added, it was clear it did not contain money. Della Morte's son said that when he turned 18 in 1954, his father made him vow to uphold the promise made to Mussolini and keep the contents of the suitcase hidden until 2025. "Over the years I have always checked up on the suitcase, which is inside a zinc box for preservation, and it is still there in the Spluga Valley, just a few kilometers from the Swiss border," the son told ANSA. Rocco Della Morte, who lives in Friuli, in northeastern Italy, told ANSA that he decided to reveal the existence of the suitcase because of his age. He is now 74. "Although I feel obligated to respect the promise made by my father, I've already made an arrangement for the opening of the suitcase and the publication of its contents," he added.