I have a 400W OSRAM Vialox NAV-E which was made in Brazil in July 2014.
It's box says it has 47000lm and 117lm/W.
However LEDVANCE/OSRAM's official documentation says it has 48000lm at 120lm/W.

Which of these is correct? Or both are?

Might be different in, say, Brazilian plant than American. Also the datasheet is not for your specific batch, it will rather be approximation of lm/W of that family of HPS lamps. I think the box is more accurate; the datasheet might just be rounded to the nearest ten.