Good point. As I recall, there were three different styles of boxes going around in 2e (and I guess 1e too):
The medium box (1 inch?) made of thin cardboard, used for the boxes in the Spelljammer line and for the Land of Fate boxed set.
The big box (1.5 inch?) made of relatively thick cardboard, used for the core Dark Sun sets, the FR box, Night Below, and other major products.
The thin box (0.5 inch?) with the same cardboard as the big box, used for smaller adventures like much of the Al-Qadim product line, Mindlords of the Last Sea, and other small things.
I don't know how things are in the US, but here in Sweden our local RPGs used to be sold in toy stores up until about 1990. At that time, all the core RPG sets (and quite a few accessories) were produced as boxed sets - a box that has different items in it, so that is rattles when you shake it, is clearly a "game," while it's a lot harder to persuade toy stores to carry a hardback book. Pretty soon after the toy stores stopped carrying RPGs, the Swedish RPG producers switched to making books.
The medium box (1 inch?) made of thin cardboard, used for the boxes in the Spelljammer line and for the Land of Fate boxed set.
The big box (1.5 inch?) made of relatively thick cardboard, used for the core Dark Sun sets, the FR box, Night Below, and other major products.
The thin box (0.5 inch?) with the same cardboard as the big box, used for smaller adventures like much of the Al-Qadim product line, Mindlords of the Last Sea, and other small things.
I don't know how things are in the US, but here in Sweden our local RPGs used to be sold in toy stores up until about 1990. At that time, all the core RPG sets (and quite a few accessories) were produced as boxed sets - a box that has different items in it, so that is rattles when you shake it, is clearly a "game," while it's a lot harder to persuade toy stores to carry a hardback book. Pretty soon after the toy stores stopped carrying RPGs, the Swedish RPG producers switched to making books.