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Bob
You asked if the holes have to be tested for listing, I am not sure of the actual wording for the listing/testing standard, but I would think so - just my opinion.

I think we can get carried away on the listing issues.

Where does it end?

Seriously, 'listed' mounting screws, listed holes in the studs.

Let me ask this are the 8-32 ears in a 4" sq 'listed' or tested for mounting the box?

I hope so because we do not buy any bracket boxes, we use a Caddy H-2,3 which mounts between the plastering and box using the 8-32 ears to hold the box, ring, device etc. [Linked Image]

Bob Badger
Construction & Maintenance Electrician
Massachusetts