Here's the 645 Jumbo case you mention. It does contain a single display tray with 24 56-card packs.
If the cases above contained 3 of these, I would expect that it would also carry a 645 code.
In addition to the Jumbos, the rack, 15-card and 29 card packs also were packaged 24 per box, so it could also be any of those...but for the mismatched code.
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