A former Group Managing Director of the Nigerian National Petroleum Corporation (NNPC), Mr. Joseph Dawha, has revealed that the contracts for the two major firms involved in the crude oil swap deal were backdated to the period when the initial contracts expired, after both firms had lifted crude oil without formal agreements between 2011 and 2014.Duke Oil Company Incorporated, a subsidiary of the NNPC and Amsterdam based Trafigura BV had contracts from October 2010 till October 2011.
