More to the point, the boxes weren’t all the same. Sure, they only had ~10-20 different pieces, but they would be placed seemingly at random. You may (or may not) have had a card to identify them, but that wasn’t tied to location.

It also doesn’t cover the quantities. Does this box have 5 cherry cordials or just 1? What about honeycomb? Opera cream? Peanut butter?

You still see this from some of the smaller chocolatiers.