A simple trick to see if a hole was drilled with a rotary drill. Run you finger up and down the hole to feel for the groves or striations left behind.
No ancient holes examined here have such grooves.
Holes usually have textured walls. The texture varies from hole to hole and never seems to be exactly the same. Some holes have rather smooth walls. Other hole walls have protrusions that we can not duplicate.
PROTRUSTIONS ON WALLS:
Some holes have protrusions extending from the hole wall.