Sotheby's real estate division has been connected in voat posts to Podesta's pizza party on Martha's Vineyard where the pizza-related map on the handerchief was found: https://voat.co/v/pizzagate/1527604 and potentially also to Alefantis https://voat.co/v/pizzagate/1502076 .

Now I see that FAPE (Foundation for Art and Preservation in Embassies) is also connected to Sotheby's. From FAPE's history page:

"Among FAPE’s early accomplishments are the formalization of a partnership with Sotheby’s to provide pro bono services to the State Department to inventory and evaluate historic furnishings" http://www.fapeglobal.org/about-us/about-fape/

FAPE has generated considerable discussion on voat as a potential avenue for shipping internationally while avoiding inspection. Here is some excellent @swordfish69 research on that: https://voat.co/v/pizzagate/1855938

We still don't know whether Sotheby's is actually shipping to embassies overseas for FAPE or whether FAPE's arrangement with them is still ongoing.