Why does the playover box have holes in it?

To be able to pick it up with one hand by sliding your finger in the hole?

Alt: to avoid suffocating my preciousss

There were multiple holes on the top, like 6 of them the size of a quarter.

It may also be used to serve hot meals. In that case the holes would prevent the glass from steaming up...

If they are using those nasty ass playover boxes, that people are handling and which come in contact with filthy chips, to also serve food in... well, that would be a choice.