[Mr70]

I'm very familiar with this kit as I have all the Chevrolet introductory training films from 1968-1972.

Yours in particular introduced the new 1970 Camaro & Corvette to the new car salesmen in Jan/Feb. 1970.

Not every dealership got these,but if they subscribed to the monthly program,Chevrolet would mail a box like this once a month out to them.
All the salesmen would sit down in front of a projector screen,and insert the filmstrip into a projector and play the record too while advancing the frames when the record went "BEEP".
These kits were originally packed full of posters,guide books,price & option sheets and others similar items.
They started them as early as the late 1940's and continued with this media till I believe 1980,when they switched over to videotapes.