MF Global’s Trustee, James W. Giddens, says that he  now estimates that the shortfall in the firm’s customer funds could be more than $1.2 billion, double previous estimates.  Mr. Giddens’s office did not elaborate on what may have happened to the money, though investigators are currently focused on the possibility that the brokerage missued customer money to cover trading losses in the days before its bankruptcy filing. While Giddens continues to search for the missing funds, in conjunction with regulators and the Justice Department, he added that the numbers are preliminary and could change. Separately, Mr. Giddens’s office said that it has already distributed about $1.5 billion in customer funds meant to support trading positions, and that $520 million in additional cash will be paid out soon. The trustee office still controls about $1.6 billion in additional customer funds, most of which could be distributed early next month.  For his statement, go to [MF Global's Trustee Statement].