It will be sometime in or after the mid 60s. Often the pale yellow was just used to cover up the original markings...clean up the box so to speak. I have a few dozen of the Cno7 crates that have all kinds of cover-up paint. I'm heading out to he shop now, so I'll check to see if there are any indications of the timeline.
Here are some more shots from when I brought home the two chests:
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These photos were from the chest painted with the pale yellow. The bulk of the markings were on the middle layer. Markings included: Top right had the number 4422-23-24, along with other numbers and letters I could not decipher. Markings on the center of the lid proved slightly more interesting. Careful deciphering makes it look like it was shipped to "officer commanding XX Canadiantraining B Dundurn Saskatchewan".
Below is the crate with all the markings stripped.
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