And a box cutter does not stab, it slices. A bread knife might stab.
We are dealing with MSM terminology.
It could have been as simple as a decently-sharpened kitchen knife for all we know right now.
I have a set of Ginsu kitchen knives at home that are wicked sharp, made of good, quality steel, and very heavy duty. Something like that can do a hell of a lot of damage, and they’re common enough.
But even a simple cheap steak knife can make serious cuts and slashes too.
I’m sure we’ll find out the details as soon as the local media figures out how to spin it as dramatically as possible.