I was going to say the same thing. Everyone stop what you are doing and order one now!
Also thought about using a large anti short bushing. Probably not technically code compliant but very adequate
I agree with cutting the box apart too, but you sill likely still have the issue of the pipe being to long or needed to work it into the new cabinet..
+1 on this... i've been using them for about 20 years.
what i've done, is slide a old screwdriver down the pipe, and
cut with a dremel tool, keeping the screwdriver between the
cutter and wire. take your time, and you can get almost all the
way around the pipe, and wiggle it to break any bits you can't
get to. when the cutoff wheel gets small, use it in the tight places.
ream it with the deburring tool, and slide a threadless fitting
on it, and you are good to go. i've done 1/2" to 2" GRC this way.