Old wooden crates/boxes?

[Kenzie]

Just wondering if someone could tell me anything about these boxes/chests , my uncles friend was clearing out a house that he was bought many years ago off his dad, his dad was a major in the army and im wondering if he has maybe brought these home?
On the bottom of them they have NATO REF stamped into them then a long number, heres links to a few pictures of them, thanks

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