I don't think it's possible to even guess close. There are unverified stories of Garands (as well as other equipment) being thrown overboard, piled up and burned, and buried over the years. Plus think about how many may have went down in the ocean during assaults at D-Day, and the Japaneseicon Islands. Plus, when boats, tanks, planes, were blown up, no one ever thinks about the weapons destroyed there. A mere rifle, with so many everywhere, was just not important then. If it malfunctioned, toss it and grab another.

So many variables, so many possibilities. All we can do is cherish the ones we have, caress it, and place it in our bed between us and the wife.
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