Although Magnum has de-stuffed a few stuffies. He's really not interested in most. Haven't figured out what draws him to one and not another.
However, he loves, Loves, LOVES getting the twist cap off of containers (milk bottles, pop bottles, etc.) Once he gets them off, he loses interest in both the cap and the container. Yeah, he's kinda weird that way.
'Course, since he seems to consider this a challenge, we let him have at it and just pick up after he has "bested the bottle." He has NEVER lost a battle, no matter how tightly we put the cap on. It never takes him more than a minute or two to walk away the victor of a cap battle!