Air holes for kids?

I had two small kids with me Friday when I purchased a large plastic storage box with a lid. They told me they wanted one each to store toys and played with it briefly before I took it home. I'll get them the boxes but I think I should drill some air holes.
I'm concerned that the boxes are more than big enough for a kid to lie down in curled up and it is possible for them to get the lid on from inside. They can easily get it off but what if one decides to have a nap inside. Right now I'm thinking about four 2 inch holes. Does that seem like sufficient?

System 7 Demo

Not really sure if this is where to post this...

IIGS available in New York (Manhattan)

Old Apple IIgs computer to donate or recyle.

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