There were still many superb pieces of eighteenth-century French furniture, sculpture and tapestry at the apartment in the rue Laffitte and at Bagatelle following Lady Wallace's death.
These, together with the estate in Ireland and the lease of Hertford House, Lady Wallace bequeathed to her secretary John Murray Scott (1847-1912), who had been her principal adviser since Wallace’s death.
He was made a baronet in 1899. Murray Scott sold the lease of Hertford House to the Government and became a Trustee of the Collection when it opened as a museum in 1900. He sold Bagatelle and many of the works of art that he had received in Lady Wallace’s will.
On his death he left the considerable collection still remaining at the rue Laffitte apartment to his friend Lady Sackville of Knole. She sold this en bloc to a Parisian dealer and works of art from this part of the collection formed by the Marquesses of Hertford and Sir Richard Wallace may now be found in museums and private collections throughout the world.