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1.
1. (n.) The bottom stage of a two-stage marijuana grinder, where keef collects after repeated grinding.

2. (n.) Less often, the grinder itself.
"Man, look at the keefbox in my grinder. It's damn near full of powder! We need to pack up a bowl of this stuff."
by AquaticPhoenix April 23, 2008
 
2.
n. A device for removing keef from one's ganja.
I'm gonna get a keef box so I can get some of that good and still sell my shit by weight.
by M-Diggity March 21, 2004