It's lot number 56YA42 equates to production line 56, 24 January 2007.
The busy grey boxes are the present design which began in late 2011.
The tops were generally shaped to receive the base of another box of the same type for better stacking. Both lids show the early method of construction, with a separate piece spot welded to each end to form the opener pivot and the hinge.
Post war models would be simple in design and more rugged than the wartime boxes. Newer M2A1s still have a separate piece for the hinge but the lid has been extended and folded over to form the opener pivot.
By the early 1950s new models of ammunition boxes were developed to replace all of the types used during WWII. 2-200 rd magazines 5.56mm in links marked specifically for M249 machine gun. Another way to represent 5.56mm ammunition in 10 rd clips and bandoleers (840 cartridges).
During WW1 Greenwood & Batley are known to have produced in excess of 705 million .303 Mk 7 cartridges.
What began as a business smithing rifle barrels, transformed into an iconic gun brand that is the only company in the nation to produce both firearms and ammunition domestically.
It is also the largest producer of rifles and shotguns in the United States, as well as the largest developer and adopter of cartridges in the world.
It, too, contains a styrofoam tray holding WINCHESTER-headstamped cases.
Its lot number 16FA61 equates to line 16, 16 January 2012.