At least two. We just moved into a new place and we know where two are.

Box cutters, none at the moment (though I've had up to 3 at once, 1 normal one and 2 of those folding types with the 1-1.5inch long changeable blades you know the type.)

Knives in general that I can and would use to cut boxes (not counting kitchen knives): 4 multitools, 5 folding/locking knives.

Like 3 or so, I ship stuff

The simple box cutters with replacement blades? Three.

However, I have a couple hundred objects that can be used to cut boxes :)

I think I have four; two in the basement in my toolbox (one medium-sized, one large), one in the kitchen and also a teeny-tiny one in my pocket that I carry all the time.

I think about five. Back when I had rabbits I'd say seven, they were viscous box killers.

I have four... somewhere around here. There's usually one nearby when I need it.

2

None. But I have an excellent folding utility knife with exchangeable blades.

Two or three. I often wish my lazy neighbors would ask to borrow one when they stuff large, unflattened boxes into their recycling barrels. #BurnAFuckingCalorie

Atleast 8. Gotta have two per room