Hyphen Trading Ltd, owned by property and metals tycoons the Reuben brothers, has demanded $8.4 million in damages from commodity trader Trafigura in a claim linked to an ongoing alleged nickel fraud case, a court document showed. Earlier this month, England's court website showed that London-based Hyphen Trading filed a claim against Geneva-based Trafigura, but no documents were made available. In a court document published on the website on Wednesday, Hyphen said it paid Trafigura for 404 metric tonnes of nickel, but never received it.