Boston Scientific Corp. (NYSE: BSX), a Marlborough-based medical device manufacturer, has sold its Quincy warehouse complex to FedEx Corp. (NYSE: FDX) for $31 million The 1 million-square-foot, two-building warehouse complex on Commander Shea Boulevard will be split into two separate operations by 2018: a global distribution headquarters for Boston Scientific and a FedEx Ground distribution center for package delivery service. Boston Scientific has owned the 500 Commander Shea Boulevard complex…