Trust me, I've seen plenty. Lived with cats all my life. :thumbsup:Cats are capable of climbing in ways you don't understand. So if that goes up to the attic the cat could very well be up there.
Personally I'd get a stethoscope and start tapping on the walls and ceiling just to see where it might be.
I actually thought of a stethoscope or dB meter, but she's not vocal enough. You could wait all day for one meow.
The owner's actually had limited success at getting a response that way. But not enough to nail down the location any better. :sad:If the cat is used to canned food, perhaps running the can opener in different areas including might get a response by the owner doing it with nobody else around.