Tony.
I notice wood slats located across the ends of the crates and one or two more in the middle, probably depending on the overall weight of the crate. That would allow for a pair of ropes to be fed through to sling the crates with a crane.
I can recall years ago seeing an old black and white news film of dock workers feeding ropes between wooden crates that size and being amazed at how quickly they could do it, but cannot remember exactly how they did it.
David
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