Veiligglas has made marbles from 1949-1961.
This can be read in the newspaper article of 1959.
"In the past the marbles were simply delivered in large bags,there are customers who order a certain quantity,
as it measured per number and not by weight,one operates from a wooden shovel with 100 spheres.
For the English, one has a shovel with 144 holes,so that one can work with gros.
Lately,the demand for 6 or 12 pieces in a box became increasingly larger""
To me It seems that the marbles are older than the packaging they are in.
Here are some boxes,pic- not mine.Also a nice pic- of the building I found lately.