The agency had arrested Vijay Nanda, an American businessman of Indian-origin, and his associate Udit Jain separately in connection with the case.
The man arrested today is identified as Pushpender Singh, a resident of Delhi.
"In his statement, he has admitted to using Import Export Code (IEC) of his firm for aiding the smuggling and smuggled out antiques to Hong Kong and Taiwan," the agency said.
An official said Singh believed to have mis-declared the items as handicrafts to hoodwink the authorities.
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The agency sleuths had recovered figurines, including that of terracotta from First Century AD, bronze figurines of Mahishasur Mardini and Ganesh dating back to 17th and 18th Centuries.
Jain was arrested on March 3.
Meanwhile, the DRI has seized branded cigarettes worth Rs 84.94 lakh from Nhava Sheva port, which were concealed in a baby ride car.