The Crime Branch of the police has arrested the accused, Deputy Commissioner of Police Madhur Verma said.
According to Verma, the liquor cartons were being transported to Patna from Gurgaon via a "specially designed truck".
Police laid a trap near Chhatarpur in south Delhi and apprehended the accused.
"When stopped, the driver of the truck said that he was carrying vegetables to be delivered to Noida. The truck was then thoroughly checked and around 520 cartons of liquor were seized," he said.
The accused claimed that they had transported such consignments earlier too, the DCP said.
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