Among the objects that surface in this catalogue for the first time is a Gnathian ware bell-krater (no. 144). An image of what appears to be the same piece features in the Medici Dossier. (See also here where Fabio Isman illustrates the same link.)
Where (and how) did the Spanish collector acquire those antiquities that have no stated collecting histories?
Krater and other antiquities featured in the Medici Dossier