The refuse person isn't the sharpest knife in the drawer. I wouldn't throw them in the trash. You may have the recipe for a fire if there are any oily rags or other hydrocarbon stuff in with them. Besides, what else if in the trash truck when they compact? Why not just use up the ones in the floater? Won't affect CYA that much. The measurement isn't accurate enough to tell. I would keep any unused pucks for when you have to raise CYA.
Al