When I was an apprentice I was sent to the hardware for weep holes for the bricky, was told all out of stock because the factory was on holedays.

Well modern technology has caught up with the bricky because you can now by them in boxes of 100 at most decent hardwares.

If he contacts the manufacturer, they may fix him up with some square holes but a bit of trimming with a bobbin sander should be ok or a dremmel for really small ones