Edward Hagaman Hall printed reproductions of portraits of Mary  
Philipse Morris (by John Woolaston, and by Copley) and Roger Morris  
(by Benjamin West) in his Philipse Manor Hall at Yonkers, N.Y.  
(American Scenic and Historic Preservation Society, 1912), plates X,  
XI, XII. Where these portraits are today is anyone's guess.

It's worth pointing out that von Erffa and Staley, The Paintings of  
Benjamin West (Yale, 1986) do credit the portrait of Roger Morris  
which Hall attributes to West.
Eric Homberger