During his lifetime BG Windus sold his paintings at Christie's in 1842, 1853, 1859 and 1862 and also at Sotheby's. The year after his death in 1867 his collection of paintings and drawings, along with household goods including furniture, were sold at Christie's and his books were sold at Sotheby's.
Christie's 1 and 2 June 1842
Drawings and sketches by Sir David Wilkie - for full details click here
Christie's 20 June 1853
Five magnificent pictures by JMW Turner RA - for full details click here
Christie's 26 March 1859
English Paintings and Drawings of the Highest Class - for full details click here
Christie's 19 July 1862
The most important portion of the Celebrated Collection of English Pictures - for full details click here
Christie's 14, 15, 17 February 1868
Sale following death of B G Windus in July 1867 - for full details click here
Sotheby 23 - 26 March 1868: Catalogue of the very select and valuable Library of the late Benjamin Godfrey Windus, Esq
Unfortunately access to the Sotheby archive is not permitted.