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I bought a box of Matzah this year, and noticed, on the top, the declaration:
"BOX SHOULD BE OPENED BEFORE SHABBOS AND YOM TOV"
Why? The box does have perforations, but could probably be opened without using them; I assume there's an inner plastic liner because the crumbs which I can hear inside aren't sifting over my kitchen, but I'm not opening the box right now to verify.
I do not recall ever seeing this warning before, on any brand of Matzah.
There is a concern that by opening the box, a usable vessel has been completed, which can be a violation of the prohibition of makeh b'patish, one of the 39 forbidden categories of "work" on Shabbath and Yom Tov.
From Halachipedia (based on Shemirath Shabbath KeHilchatha 9:10-1):
Cardboard boxes closed with gummed paper or tape, papers stuck together, or a paper wrapper may be (ripped) opened on Shabbat only if one ruins the box in a way that it’s unusable as a container afterwards (nor is any part of it useful which is violated if one tears along the edge of prize tokens printed on the wrapper).
In addition to the above, from here:
One must be careful not to tear letters on the packaging.
Tearing the lettering would be considered mocheik - erasing.
