Canon Color ImageRunner C3380 Reference Manual page 400

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Replacing the Toner Cartridge
Close the protective packaging with the used toner cartridge
inside, in the same way as how the new toner cartridge was
packaged.
Hold the top portion of the protective packaging, and place it
in the box that was used for the new toner cartridge.
Close the flaps of the box.
When closing the flaps, close the right flap first, and then close the left flap.
Lastly, insert the tab into the slot.
IMPORTANT
Make sure to insert the tab into the slot completely when closing the flaps of the
box.