Companies like Tiffany, which has a trademark on the distinctive blue color of its boxes, also took a keen interest in the proceedings.

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Premium sandwiches like the Big N' Tasty are now put in boxes rather than paper wrappers, saving a few seconds, and the boxes are color coded by sandwich to improve speed and accuracy.

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Landis' original Valentine's Day gift now anchors a collection of more than 100 boxes, arranged by color in locked glass shelving in their bedroom.

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