All mine needed to hear was the rattle of the door on the cat carrier. Then they vanished. "blink cats"
It is not whether they know, it's do they care. I have our new boy Finnegan on the chair next to me. I cannot figure out how to get pictures in this thing.
Pics can be put on any host site and linked, or if you do a premium membership you can post them right here.
You're in the wrong part of the Monster Manual Tho cats do manage to make things disappear fairly often, usually under the fridge or couch.
I would leave the carrier out all the time, sometimes taking the door off, so the cat could use it as a resting place. Had one cat, Mickey, who would go into the carrier when I told him "Let's go!" Was moving from California to Illinois and when it was time to leave, I started looking around for him. Finally found him in the carrier all ready to go.
Two of my six have long hair that gets matted. So they've gotten shaved! This is Willow: And this is Mister: