Thats a pity Jeroen your grandfather would have known.
Hansel,We didn't get those beautiful boxes for good behavior on school,a biblical picture was all we got.
In the 50's Netherlands was still very poor,caused by the war.
We got from family cheap Japanese toys and we got some old stock pre war beautiful German toys.
I can't remember if the marbles were sold in boxes,i don't think so.
The only packed marbles which i remember as a child were sold in crocheted bags,they had clearies or opaque marbles in them,
i think they were old stock left overs from Germany.
Here is such a bag.The clearies do have pontils