Henry Acosta, a mediator between the Marxist FARC rebels and the government, gestures during an interview with Reuters in Cali, Colombia September 17, 2016. REUTERS/Jaime Saldarriaga

The Geneva Ports Francs (Free Ports) building is pictured in Geneva, Switzerland September 6, 2016. REUTERS/Denis Balibouse

A "handle with care" sign is pictured on a box containing art at Geneva Ports Francs (Free Ports) during a media visit in Geneva, Switzerland September 6, 2016. REUTERS/Denis Balibouse

An easel is pictured inside a private showroom in a warehouse of Geneva Ports Francs (Free Ports) during a media visit in Geneva, Switzerland September 6, 2016. REUTERS/Denis Balibouse

David Hiler, Chairman of Geneva Ports Francs (Free Ports), attends an interview with Reuters in Geneva, Switzerland September 6, 2016. REUTERS/Denis Balibouse

A staff of Geneva Ports Francs (Free Ports) walks in the wine warehouse during a media visit in Geneva, Switzerland September 6, 2016. REUTERS/Denis Balibouse

A staff of Geneva Ports Francs (Free Ports) handles boxes in the wine warehouse during a media visit in Geneva, Switzerland September 6, 2016. REUTERS/Denis Balibouse

A box of Chateau Margaux red wine is pictured in the warehouse of Geneva Ports Francs (Free Ports) during a media visit in Geneva, Switzerland September 6, 2016. REUTERS/Denis Balibouse