Egg boxes hold 12 (I think) flats with 30 eggs each.

You can get them from supermarkets. And they're thick cardboard. Great for moving books.

This is an egg box where I’m from. You wouldn’t get anything in it except eggs or maybe thimbles. I guess yours are different.

https://www.amazon.com/Cartons-Flattop-Carton-12-Egg-Recycla...

We call that a carton not a box.

Yes, that was my point.

egg box / case : http://www.eggboxes.com/media/ecom/prodlg/30doz.jpg

egg flat : http://www.eggboxes.com/media/ecom/prodsm/5x6superflat.jpg

egg carton / box : http://www.eggboxes.com/media/ecom/prodsm/005.JPG

Ostrich eggs?