Remington introduced the red and green boxes with their Shur Shot trap and skeet shells with the "New Remington Crimp" introduced during 1939. In 1945, when civilian production resumed, they rechristened the "Remington Nitro Express" as "Remington Express" and put them up in the red and green boxes, still roll crimped --

[Linked Image from i.imgur.com]

During 1947 the Remington Express got the "New Remington Crimp" --

[Linked Image from i.imgur.com]

The red and green boxes lasted into 1961 when Remington began introducing plastic shells.