The 'golak', or offering box, was yesterday installed in front of the Guru Granth Sahib where devotees pay obeisances.
The name of slain militant leader Jarnail Singh Bhindranwale has been painted on the offering box in the Gurmukhi script.
The memorial, erected recently by Sikh hardliners on Golden Temple premises, is dedicated to all those killed during Army's Operation Blue Star in June 1984 which was ordered by the then Union Government to flush out militants holed up inside the shrine.
Mann said that the offering box was installed in full view of the public, including devotees, Shiromani Gurdwara Parbandhak Committee task force members and policemen in mufti. No objections were raised against the installation, he added.
Upon being contacted, an SGPC official said that they would look into the matter, adding that it would be too early to comment on it at the moment.