"Mike Marlow" wrote

Actually the drywall guys are the bane of electricians. They don't care
one hoot about those boxes. Very common to find a glob of dried compound
in a box. Same thing with painters. That said - the mud chips out very
easily and if it is part of a smear that ran wild from the wall, just
score it through along the outside of the box and chip off the errant
remainder. For the most part you can easily mud right up to the box with
no problems, but if you do lay a blob in there it's no big deal. The
screw threads are no problem at all. The screws will run home just fine.
If your wires are properly tucked inside your boxes, you have nothing to
worry about from drywall tools.
The screws sticking up will make finishing harder, as will wires sticking
out or box sticking up.