The red and green shell boxes first appear with the New Remington Crimp on their Shur-Shot skeet and trap loads in 1939, but the Express loads stayed in this style box up to WW-II --
By the end of the War the Express shells were coming in this style box --
For 1947 the Remington Express shells began getting the New Remington Crimp --
As for the 28-gauge Rifled Slugs --
I have searched through Remington ammunition catalogues and price lists beginning with the end of WW-II. The 28-gauge Remington Express Rifled Slug is first listed in a couple of undated catalogues attributed to 1953. The first thing I find dated that has the 28-gauge Remington Express Rifled Slugs is December 16, 1954 --
The Remington Express 28-gauge Rifled Slug remains in the offerings into 1961. By the January 10, 1962, Remington Ammunition catalogue the plastic cases are replacing the old ribbed paper cases and the 28-gauge rifled slug is no longer listed.