The Telephone numbers will give the general time frame of the Boxes…as Telephone usage and traffic increased, Numbers were re-organised with Zone Prefixes, and additional digits. This has already happened several times since the 1950s.
The Company ( Private Limited==srl == societa’ a responsibilita’ limitata…US LLC, or British/Aussie Pty.Ltd.) obvoiusly supplied Cine-Citta, the Rome studios originally expanded by Mussolini in the 1920s, from the original private Film studios built before WW I. ( “Film City”, near Fiumicino International Airport…occasionally, in some Sand and Sandal epic, a Boeing 707 is seen high in the skies!!!)
The Blanks would be Factory Loaded BPD, used by the Italian Army for (Lee Enfields etc) in Conscript training, 1950s) and by the Italian Airforce (“7,7” MGs) and Navy ( again, Lee Enfields, still in service into 2000.)