Fannie Mae’s plan to unload potentially billions of dollars’ worth of non-performing loans has been delayed and may even be scuttled, according to industry officials tracking the project. Fannie has been working on an NPL sale for close to a year, and has even hired an investment banker, Milestone Advisors LLC, to guide it through the auction process. Initially, it had hoped to offer a package of $250 million of delinquent home mortgages for sale to the highest bidder. Although the government-sponsored enterprise would not comment...