The boxes are not always listed on the menu, so be sure to ask. If the location does not offer them, the cast members usually know the closest place that does. I have also seen them in the vrab and go areas of most on-site resorts.
The box it comes in is great for holding leftovers.
Bonus: if it survives the trip you can use the box to hold small park souvenirs such as maps, times guides, etc.
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