There are a large number of sources that have discussed the Italians issuing only 1 or 2 magazines with the BM59 over the last 40 years I've been interested in the BM59, and logically it stands up to scrutiny.So no primary source documentation and just conjecture, got it.
But by all means balance all that against your "I have a hard time believing...." statement of your inability to change an opinion.
Got it.