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However, the thought occurred to me those boxes might represent boxes that have been "re-purposed" for something else-- like storing crew gear or for collecting "trash". They might weather out that way over time, but not for newly issued MREs.
Exactly, an empty box left out in the rain and sun for a period of time.
Either way, not sure what the value is of that specific item. Because if you're going to use that box as an accessory on a vehicle, you would use the 'new box'. If you wanted to use it as an item of trash, the vehicle that discarded it would be long gone. Lastly, disciplined units police their trash (unless you want to depict a FOB inhabited by the Georgia National Guard in Iraq, 2005).