U.S. Treasuries slipped on Wednesday after the previous day’s surge drove benchmark yields back near their lowest since 1950 after data showing a rapid fall in house prices and consumer confidence plunging to a record low. * Treasuries have also surged as falling mortgage rates and the Federal Reserve’s plan to buy MBS have forced mortgage players to anticipate a wave of refinancings, buying bonds to hedge the risk of shrinking portfolio duration. * On Monday the Fed announced details of a pl