The pucks will be okay as long as they have not been exposed to moisture--if there's any indication of bubbling or bowing on the lid of the container, then they've gotten moist and have begun releasing gas.

If the other stuff is less than a year or so old, it's probably okay....I'd buy it if it were still sealed, if I needed it...at garage sale prices, if only half were still effective it's still cheaper than retail!

Janet