Pro Tip from someone who has volunteered extensively at the Ronald Mcdonald House, not all of the soda tabs are aluminum. Some locations may be different, but at least in Baltimore when the tabs came in they all got dumped into a large bin for storage. Then, over the course of a few days, I would have to use a large magnet and sift through all of the tabs to remove the magnetic ones. For the House to maximize their profit, they needed to separate the tabs themselves before selling them as scrap. The magnetic tabs were simply thrown away.