It’s pretty hard to determine the actual insect that could be causing holes without a picture of the insect.
by the holes if it is a pest I would hazard a guess and say it’s something small, not too extreme with munching, so shouldn’t be anything too bad at this point.
are these indoors, outdoors etc?
what insects do you normally find where you live as common insects can vary Continent to continent.
if this is indoors what do you normally see inside your home?