Yes, Yes, I am sure that is a Mouse in The Wall. But boy is it out of the way. As the crow flies, it is 1.01 kms from the parking area. By trail it is 1.34 kms, but boy those meters are a good hike. Will get the sweat going.
Anyhow, when you get to GZ, you will have to face the wall in order to find the mouse. It is a little black mouse. Please ensure you close it up and rehide in the same spot. It is such a cute little mouse.