old 1950s 16mm movie film reels w/ mailing cases vintage shipping labels photo props

Lot of three mid century vintage 16 mm movie films in the original old mailing cases with the old shipping labels, including a colorful Air Express label. One of the cases is marked 1956.

These appear to be old educational and / or instructional movies. The reels are about 10 1/2" across and mailing cases are heavy fiberboard with reinforced metal corners and olive drab webbing fasteners.