Something is needed to keep the J-card/flyer in place until it reaches the shrinkwrapping station.
Reminds me of the problem there was with a couple of the early Eureka steelbooks - KING OF NEW YORK and DOUBLE INDEMNITY - where it was necessary (for me) to use WD40 to remove the extremely stubborn glue residue.
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This good-looking steelbook arrived yesterday . . . background definitely not 'Forrest Gump' white or Studio Ghibli grey but exact same shade as the WB Premium Collection steels.