Bookplate Take Three

I've received a very helpful e-mail from the Disraeli Project about the interesting bookplate. At this point, we know Sir Samuel was living at Hughenden--but not how he managed to grab one of Disraeli's books (if the book really is an association copy). The DP has no positive evidence that anything from the library was sold, so how did Sir Samuel go about acquiring the book? (Souvenir? Gift from the estate?) The plot thickens. The DP (which agrees that this is indeed a most interesting bookplate) suggests asking Christie's. It might also be interesting to see if there are any auction records for Sir Samuel's effects.