Italian journalist Fabio Isman has written in today's edition of Il Messaggero (May 31, 2011) about a new sighting from the Medici Dossier. He reports that Cambridge University researcher Christos Tsirogiannis has identified the pair of Canosan kraters in Christie's Rockefeller Plaza sale on June 8, 2012 (lot 99) from polaroids. The kraters were reported to have been in a private collection in New York, and were sold at Sotheby's New York in 1986 (30 May 1986, lot 24).
Who consigned the kraters to Sotheby's in 1986? What other material originating from Medici was passing through the New York market in that period?
I presume that the recent return of similarly sourced material to Italy has set an appropriate precedent for Christie's.