Another two men were later arrested for their alleged involvement in the case.
Two of the suspects have been charged, while investigations are ongoing for the other two, said Singapore Customs.
Buying, selling, conveying, delivering, storing, keeping, having in possession or dealing with duty-unpaid goods are serious offences under the Customs Act and the GST Act, said the agency.
Offenders can be fined up to 40 times the amount of duty and GST evaded, jailed up to six years, or both.
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