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A mounting hole should be a bit bigger than the screw that it will fit, the coating material of the hole's internals does not matter at all. So it is no need to plate the mounting holes.
If the screw is used to ground the board, then you need to plate the hole.
The pcb builder may mistakingly not plate all the holes for small chance, I'd make all the holes plated.
Pretty good and useful info to my job. Keep on checking your post.
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