Earlier this month MDN told you that WPX Energy had sold contracts and contracted capacity to buy and sell natural gas on on Transco’s Northeast Supply Link pipeline for $200 million to an undisclosed buyer (see Mystery Buyer to Pay WPX Energy $200M for NE Marcellus Assets). We told you our best guess for who the buyer likely is: Southwestern Energy, the same company that just completed purchasing WPX’s leases and wells in Susquehanna County in February for $300 million (see WPX Finalizes Sale of NEPA Marcellus Leases/Wells to Southwestern). Yesterday WPX issued a press release to say the deal is now done and the money in the bank–but they still don’t/won’t name who the buyer was…