How was the Gold of Tolosa transported?

Was the Gold of Tolosa sent by sea, and how were the gold and silver divided for transport?

It went overland in separate gold and silver shipments; the silver arrived, while the gold vanished after an alleged attack.

The Gold of Tolosa was sent overland rather than by sea. The gold and silver were divided by metal instead of being spread across several mixed consignments. The silver reached Rome, while the much more valuable gold disappeared after an attack by supposedly well-armed marauders. Sea transport carried the danger of shipwreck, although it may have offered a less obvious route. The separation and loss do not prove who stole the treasure, but they explain why Caepio remained under suspicion.