This really is a big deal. It would mean that a lot of Mortgage Backed Securities actually were not backed by anything. Yes, that is called fraud.
"Evidence is mounting that for cost reasons, starting in the 2004-2005 time frame, originators like Countrywide simply quit conveying the note. We are told this practice was widespread, probably endemic. The notes are apparently are still in originator warehouses. That means the trust does not have them (the legalese is it is not the real party of interest), therefore it is not in a position to foreclose on behalf of the RMBS investors. So various ruses have been used to finesse this rather large problem."