You can keep it stored and leave it in a tub with toxic written on it and the authorities will dispose of it or you can take it to your local council waste site and they have a toxic waste bin.
If you're not desperate to get rid of the rest, then hang onto it in case the small pots let moisture in before your CTB day, that's what I'm doing with mine (I have small air-tight pots but waiting for scales from amazon)
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