Still Tracking the Odor

I still can't find it. The smell of that decaying mouse is not only driving me nuts but giving me a big ol' headache too! I've moved the appliances (again), went through all my shelves, took the food off, moved the pans.. everything, I can still NOT find where it is.

Sure, it's probably in the walls. But then, the smell is moving- moving as in a breeze wafts the odor here, and then there, and then over there.. and back again. I am thinking I need a friend to stop over and help me look. Perhaps I am just overlooking the dead and decaying carcus. (This is SO gross!)