RCBS used a couple of different boxes very early dies used a plain box and they went to a light green box and the last boxes they used are a dark green. I'm not exactly sure of the date but mid to late 60's should be pretty close. RCBS dies are dated either with the date or a letter code, I think I have the code dateing somewhere in my stuff. The early dies were made by Fred Huntington in CA. In my opinion the best!!!! Just my opinion, dies have always been a good value taking in the amount of machining and quality material that are used to make them.
Joe