7.92mm Brens were definately there and captured because we had some ythat came down to the joint Intelligence Cell in Central Malaya. They were the first that I had seen (and heard of if I was truthful.....). The ones we had will have come from China, NVn, down the HCM trail down to the south to the VC there.
It is recorded fact that there were indeed some L4 Brens that went to Vietnam by the NZArtillery as part of their kit and by default, as part of the (unused) ground CES of the tanks that went from Pukka.