Well around here, pots used for planting usually have holes. If not, they'd have hole spots where the holes are supposed to be and the material is thinner and easy to break through.
I am not sure if I explain myself. It's like they didn't drill holes all the way. Maybe this way the buyer decides if they want holes or not.
Maybe it's the same over there?
Check the pots, feel them, look inside against the light,holes may be there, but a little "hidden".