His library was sold at auction by Evans on 11 May 1820 in 243 lots, the anonymous catalogue entitled 'the choice and valuable library of a distinguished man of fashion'. A contemporary note on the copy of the catalogue at Cambridge University Library (shelfmark Munby.c.122(11)), ascribes the collection to Mackinnon.
His extensive library was sold by auction on May 11, 1820, in 243 lots, with an anonymous catalog describing it as 'the choice and valuable library of a prominent gentleman'. A note from the time places the collection in the possession of Mackinnon.