What order and if there's a particular reason for the given order.
For me:
(1) Wicked wings: Got to have them whilst they're hot.
(2) Chips dipped in potato/gravy: Similar reason to above. But chips are inferior to wicked wings, so second. The chips aren't too great for spooning the potato/gravy, so the chips are usually depleted before finishing the potato/gravy.
(3) Potato/gravy: Use the provided spoon to scoop out the leftovers. On the odd occasion, I might pour the leftovers (if it's more in a gravy form rather than a potato form) onto the zinger burger for each bite.
(4) Zinger burger: Last.
I tend to crack open the drink halfway through the chips.
You mentioned all the food inside the box.
BUT.. How do you eat the box ??