Note that the LOC report deals with “paper” in the context of books, documents and newspapers.
I am not sure that the pasteboard material used in most boxes for cartridges is subject to the same results as thin sheets of paper to be handled while reading them. A pasteboard cartridge box surely is subject to the same chemical and environmental hazards, but they may not become unusable or disintegrate in the same way or at the same speed as pasteboard.
Surely storage in moderate temperatures, low light, and low humidity is a very good idea.
Personally I do not feel that using shrink wrap will accelerate damage to the cartons for the stuff I am interested in (primarily military boxes circa 1890 to present). I have not noted any deformation of the boxes from shrink wrapping, although different material and methods may produce different results.
If I had some very rare and valuable and fragile iboxes, I would be much more cautious about wrapping.
I have seen some military boxes damaged by “leaking” cartridges having primer/powder decay, and it may be best to remove “leak prone” cartridges and store them separately from the box.
Your mileage and preferences may vary. Some collectors love to open sealed boxes to verify contents, while others view that as vandalism. Wrapping or not wrapping may be a similar personal preference.