Donate it, drop it off at your local watering hole!Is there anything that can be done with the chalk after being used to this point (see pic). Seems like there is at least 1/3 of the block left and seems wasted.
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Or grind it up for a chalk line.
ORRRRR... Take it back to Costco. Tell them you keep Miscueing and they give you a whole new box!! Ha ha ha, J/k...