Preliminary probe indicates the money was being smuggled from Tirupur in Tamil Nadu to Vengara in Malappuram, says district police chief.
India said it would investigate cases linked to the data dump, known collectively as the "Pandora Papers", while Pakistani Finance Minister Shaukat Tarin said officials named in the documents would be investigated - including himself.
The 'Pandora Papers', leak of troves of financial records in offshore tax havens, has been obtained by the International Consortium of Investigative Journalists (ICIJ). More than 300 Indian names are part of the list.
Police said Dharmarajan, who had lodged the complaint of robbery, contacted eight BJP leaders, including State secretary K Surendran, from the crime scene at Kodakara immediately after the incident on April 3.