A shipment of Nvidia hardware worth $11.4 million vanished in transit between Oakland and Fort Worth, Texas, over the summer and more than two months on police have reported no arrests and no recovery of the cargo.

Six pallets of Nvidia equipment left Oakland on 29th August bound for Fort Worth. The hardware was collected on schedule by a truck carrying the logo of a food transport company, then went off the grid. Nobody realised anything was wrong until early September, when the buyers noticed the shipment had never turned up.

When police tried to trace the truck’s route, they found it had made several stops lasting multiple hours after collecting the hardware. They then lost track of the vehicle in San Bernardino County, California.

Oakland police confirmed that a grand theft report was filed on 13th September and that the investigation remains open. Authorities have not said which Nvidia hardware was taken or exactly how the theft was carried out.

It is the latest in a run of increasingly bold hardware heists. Thieves have made off with more than $100 million in similar shipments since June. Investigators cited by NBC News say the criminals have shown planning and sophistication, using techniques such as GPS location spoofing and, in some cases, arranging collisions with police escort vehicles. Stolen components can be stripped down and sold in grey-market deals or shipped overseas to places where access to US technology may be restricted.

It is not the first time Nvidia kit has gone missing in this part of California. Last year, $7.5 million of Nvidia hardware was stolen in Fremont and Union City. The current case leaves six pallets, worth $11.4 million, unaccounted for, with the trail running cold in San Bernardino County.