Your BK is in preschool, and has been receiving a lot of little presents due to an upcoming holiday. This tends to happen with all of the traditional western holidays- Halloween, Valentine's, Christmas, Easter, etc.
One day, a gift bag arrives in your BK's cubby, and it is filled with snacks, per the guidelines the school has. One snack is a very popular snack bag like Hello Panda, choco. Your BK and the classmates LOVE Hello Panda, and they get Hello Panda cookies as gifts all the time. Here's the catch: the individual bags do not offer nutritional info, and are obviously from the large box linked above. Logo is there, just no nutrition/ingredient list.
Even if your kid eats Hello Panda snacks (or something of that ilk) regularly, do you feel disinclined to let BK have this because it lacks the outside label? Would it make a difference if the parent disclosed the ingredient list on a separate sheet of paper taped to the snack? Do you shake your fist at the Meiji brand for being lazy with their variety packs?
How about if you're the parent that created the gifts for your BK's classmates. You open the beloved snack box to find that they didn't bother to list ingredients on the individual packs. Do you run back to the market to find something else for the goodie bags? Do you copy/paste nutritional info for each packet and attach it to the bags? Do you care? Do you once again shake your fist at the Meiji brand for being lazy with their variety packs?
EDIT TO ADD: The only allergen variable is wheat, although wheat gluten is not forbidden. Nuts and peanuts ARE banned from a lot of schools and preschools, so for the sake of this scenario, let's say that applies to BK's school as well.