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.