Egg boxes are normally made from either cardboard, or polystyrene. Try to choose cardboard as this has many more recycling and re-use possibilities.

For either type, return them to your supplier as they can be used several times, provided they are clean.

Cardboard boxes are good for composting and for childrens entertainment! Every home should have a large cardboard Tracey Island (from Thunderbirds) made from papier mache and egg boxes.