Hours after seizure of fake currency and stamp papers from a Nashik bungalow, police raided a house in Panvel, Navi Mumbai, on Monday and found "426 small boxes" of old, used stamps and coins of various nations.

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Whether the collections were original or fake is yet to be ascertained, the police said.

Prasoon Agarwal, arrested in the Rs 72 lakh fake stamps dump case, owned the house, police said. The Nashik bungalow also belonged to him.