The cigarete packs were used to conceal the Gold bullets inside, and safe delivery to Scaramanga.
These are SD studio bullets used in the cigarette pack, i didn't want the 007 markings to show for it was not seen in this scene, only in the beginning of the movie do you see the 007 markings on the bullet.
More from The Man with the Golden Gun: Filming of the First James Bond Film in Hong Kong (1974)