Hi Berkley, The "containers" are designed to hold the lighted match end. The one with the holes/vents is designed to safely hold a LIGHTED match while the other with no holes is to extinguish the lighted match. A very crafty thing to keep things safe when in use.
From photos I have seen, these "containers" vary in size/shape. They are NOT permanently attached to the stock of the gun. They are held in place by the match cord wound around the stock.
Stu
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