Senior Assistant Superintendent of Police Alamgir Hossain said they seized the boxes as those could be a security threat and such things can not be placed in an international airport.
The boxes were for Late Yaruddin Khalifa Darbar Sharif of Mirzaganj (Patuakhali).
The police officials said that a syndicate is behind the donation collection and expressed doubt over whether the money is sent to the Darbar Sharif.
The management committee of the shrine allows people to collect money in a specific area across the country in exchange for a fixed amount of commission.