Finally picked up some box extenders, so I thought I'd give an update.
The extenders didn't work. They depend on fins catching the drywall, and
the people who put in the drywall didn't unscrew the plugs, they just cut a
bigger hole. So here's what I did:
I bought a regular box. Set my table saw for 3/8" and cut. Put the
rectangle in the hole, and found I really needed 3/8" on 1 corner and 1/8"
on the opposite corner. So I marked it with a permanent marker. Then
pulled out my angle grinder and grinded away. Now it extends the box flush
with the wall and is code-compliant. Cheap too, if you don't count my time
:) Now I just have to do it again & again & again (about 12 times total).
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