Police arrested Mahender, based on a tip-off, and on his disclosure the others, Manish Sharma, Arun Nagar, Roshan Gupta, Jashpal, Mohd. Arif Khan and Saraju, were also nabbed.
Two pistols along with seven live cartridges, a knife, Rs 12.5 lakh in cash, a motorcycle and jewellery - 18 diamond studded gold rings, 2 pairs of diamond ear rings, and one diamond pendant - was also recovered from their possession, police said today.
Police said that the accused had given some jewellery to one Kishan to sell it in the market, but that person was still at large.
According to the cops, the accused got information about the movements of the courier company's employees through a tea seller, Sarju Pandit, who used to supply tea to the company's employees.
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With the arrest of the seven, police also claimed to have solved two other cases of dacoity, one in the area of Kamla Market police station and another in the area of DBG Road police station.
In the Kamla Market case, the accused had allegedly looted a bag containing gold worth Rs 32 lakh in September last year.
In the DBG Road case, they had allegedly looted gold jewellery worth Rs 2.5 lakh in July 2015, police said.