Here are 2 rolls of 16mm x 50 feet Kodachrome Packette film cartidges. This is a very unusual film format introduced in the early 1930's as a drop in film cartridge. The concept never took on and only a few cameras were ever made ( mainly simplex) that accepted the format. It almost died out completely when Kodak introduced their 16mm magazine cameras. These 2 film boxes one daylight and one type A are a fairly rare find. One is dated 1952 and the other 1955. The all metal cartridges inside  are  contained in another metal box. There does not appear to be any film in cartridges. These film boxes will look well in your display they would be the smallest 16mm boxes ever made measuring only 12cm x 7.5cm x 2.5cm.