The mystery of the missing $1.2 billion in MF Global customer funds is solved — maybe. One of the small army of investigators searching for missing moolah said yesterday that she and her team of probers have located the money — which, after more than six weeks, has become one of the great mysteries of Wall Street. “We know where all the money went,” Jill Sommers, who is heading the Commodities Futures and Exchange Commission’s probe, told Reuters. The only remaining hurdle, she said, is “finding out which ones of those transactions are legitimate and which ones of them are illegitimate.”