I had cleaned out my car a few days ago, and brought in the kleenex box that
was in the car. I set it on a book shelf just inside the door (I never put it
there)
I decided it was time to freshen Tuck's tricks, and I moved the kleenex box
from it's unfamiliar location, and put it where it belonged while Tuck was
out of the room on another errand.

I sneezed , expecting him to go to the usual spot, but instead, he went
directly to the shelf where the kleenex box had been last. Apparently it
seems he knew he may have to retrieve it for me, and made a mental marker to
it's new location, just in case.