The incident happened on Saturday night in which the security guard of the office was also injured.
The accused held the employees at gunpoint, ransacked the entire office and decamped with Rs 25 lakh in cash, a police officer said.
The accused attacked the security guard with pistol's butt when he tried to stop them from fleeing.
Police said they suspect the role of some insiders as the accused apparently knew where the cash was kept and targeted the cash box only.
A CCTV camera installed at the office has captured the suspected robbers entering the company office at 7.48 pm and leaving at 7.50 pm.
The company has tie-ups with several e-commerce companies and delivers items ordered online.
The day's collection amount is counted in the evening and deposited in the bank the next morning, the officer said.
A case has been registered and the CCTV footage is being analysed to gain clues on the accused while the present and former employees of the company are also being questioned, police said.
Get Breaking news, live coverage, and Latest News from India and around the world on NDTV.com. Catch all the Live TV action on NDTV 24x7 and NDTV India. Like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.