The 50-year-old German wants to sell the trophies to pay off his debts after he was declared bankrupt last year.
Two Australian Open trophies and three from Wimbledon are missing. He also is missing an Olympic gold medal.
"Mr Becker is unable to recollect where they are located," said a joint statement from Becker and his London-based bankruptcy trustees.
The All England Tennis Club, the German Tennis Federation, the US Tennis Association, Tennis Australia and the International Tennis Hall of Fame have said they do not have the trophies.
