The long-rumored sale of roughly $60 billion in mortgage servicing rights by Flagstar Bancorp is likely to get signed in the fourth quarter, but the bank continues to be coy about which investor it’s negotiating with. According to servicing advisors familiar with the transaction, Two Harbors Investment Corp. has been talking to the thrift about buying MSRs, but at press time it was unclear if the real estate investment trust is the winning bidder on the deal. Officials from both firms declined to comment. Flagstar, in a recent earnings call, confirmed...