You will notice that all those blue boxes are 5 hole rivets, while the K frame blue boxes were 4 hole rivets used on the corners. The boxes used to ship Target stocked K frames were actually N frame blue boxes. They were higher and wider than the gold K frame boxes. Some were plain blue with nothing inside the lids and were supposedly used to return repaired N frames from the factory. Others were stamped with instructions as shown above.

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Gary
SWCA 2515