It’s fourth-hand information, but it’s the closest investigators have come to proving former MF Global CEO Jon Corzine knows where $1.2 billion in customer funds went missing: Sean Duffy, the executive chairman of CME Group, said Thursday that one of his auditors took part in a phone call in which an MF Global employee indicated Corzine knew about loans being made from “customer segregated accounts.” Duffy said the loan was worth $175 million and made to a European affiliate in the days before MF Global’s collapse. Corzine also testified before the Senate Agriculture Committee Tuesday, saying, "I simply do not know where the money is.”