Chhota Rajan has been accused of threatening Panvel's builder Nandu Wajekar and attempted to extort Rs 26 crore from him.
The Chief Post Master has clarified that the employees should have been careful in verifying the pictures.
A case of extortion has been registered against Priyadarshani Nikalje, niece of Rajan, and two others, the anti-extortion cell official said.
Lakdawala, 50, who was on the run for two decades and was once a close aide of Dawood Ibrahim, made this revelation during interrogation by the Mumbai Crime Branch.
J Dey murder case verdict: Gangster Chhota Rajan, seven others sentenced to life imprisonment; journalists Jigna Vora and Joseph Paulson acquitted
J Dey had written articles in the months preceding his murder that showed the Chhota Rajan in poor light due to which the gangster got him eliminated, the prosecution had said in the court.