Registers: good idea!
He could not climb stairs well, so that kinda rules out the Safe in the basement, or stashing in the attic.
I checked his car & all shelves: he was 6' at his last measurement, so looked on all shelves.
The freezer in his bedroom bar is sealed shut from lack of use & not being defrosted, so it's not there, already checked his fridge & looked for false cans where it could have been stashed.
I love Pulp Fiction.