I just removed two punchouts in a box, realized that they won't work where I need them, is the box junk or can I just use the other punchouts and leave the original ones open?
The box isn't junk. You can still use it, but I highly recommend you don't leave the holes open. Inexpensive knockout fillers are available that snap in to the holes to close them. It is a code requirement that unused holes be sealed.
For lack of a better description, it looks like a plug. It has a flat surface, and little feet that connect into the knockout hole. Any Lowe's, Home Depot or supply house should have one.
I have heard the plastic ones called a push peeny, but the metal ones were always called KO seals.
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