Two country-made revolvers, a huge cache of ammunition and documents including a few maps of India were seized from Dey's rented accommodation in Basirhat's Raghunathpur in North 24 Parganas district during a raid, a senior officer of Kolkata Police's Special Task Force (STF) said.
Last Tuesday, the STF arrested Dey, along with two suspected terrorists - Samsad Mia alias Tanvir Saiful and Rizaul Islam - allegedly working for Bangladesh's banned terror outfit Ansarullah Bangla Team (ABT) from the city's Kolkata Station and seized several forged documents including Aadhaar cards, PAN cards besides arms and ammunition from their possession.
Dey is suspected of supplying arms and ammunition to agents of Bangladeshi terror groups, who have managed to sneak into India.
According to the senior officer of the STF, who was part of the raid, Dey's second wife Afroza Bibi was also grilled for over an hour.
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"We tried to find out whether she was involved with Dey in his crime of supplying arms and ammunition. From her answers, it seems she knew what Dey was up to. We are still looking for answers to some crucial questions," he said.
"Though it is yet to be clear for whom Dey was preparing the order, it seems that it was part of the arms and ammunition package he had taken on contract to the Kolkata Station for the two ABT terrorists last week," the officer said.
Dey, who was earlier living in Ichchapur in North 24 Parganas district, was earlier arrested for his involvement in an arms dealing case, besides three other cases, under different police stations in the city which are still pending, police said.
Police are examining if Dey had any links to the Ichchapur Rifle Factory, where his late father was an employee.
The police came to know the names of three terrorists -- Shopon Biswas alias Sajol Ahmed, Mohammed Aftab Khan alias Umar Faruque and Nayan Gazi alias Zafar -- after grilling Samsad and Rizaul.
The city police has issued a lookout notice for the three suspected terrorists and shared their photographs on their Facebook page and announced a reward for individuals providing information.