Found the rascal.

I dropped the top of the priced reduced down to my level juice when I sneaked a man style swig from the container the other night. Despite hours spent kneeling on the floor via the orange mat in the background (my knees hurt too much to kneel without aid) with a bright LED torch seeking out all the hidey holes it may have rolled into I gave up.
Then a day or two later I saw it near the entry to the bedroom, it naturally had managed to roll all the way from the far right of the pic, around the corner beyond my scope of belief, but I suppose that's fairly normal.