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what are these holes in foam board under roof??

This pic is from a boroscope, in a sealed off section of our finished attic. This is the board that holds up the insulation against the roof. There are no water stains by the holes, so what the heck are they from? Roof nails maybe?

I’m investigating this area out of curiosity but also making sure we don’t have water intrusion issues as we had one recently in another part of the roof.

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