With prices relatively low, vintage non-agency mortgage-backed securities have been a hot item in recent weeks. Some analysts suggest that the buying boom has already peaked and the collateral is overpriced again, though a significant amount of non-agency MBS is still available for sale. “The non-agency market has rebounded in 2012 after a poor second half of 2011,” according to analysts at Bank of America Merrill Lynch. The Federal Reserve’s two sales in as many months of Maiden Lane assets are as good an indicator as any that investor demand for non-agency MBS is strong ...