A Tesco worker in Wokingham discovered what police believe to be Class A drugs as he unpacked bananas.
The worker was sorting the fruit shipment from South America when he discovered the stash of five bags inside a container.
Police were called to the premises at the Tesco superstore in Wokingham last week.
Thames Valley Police told ITV News London:
A Tesco spokesperson told ITV News London that they have reported an issue to the police and are helping them with their investigations.