Several cardboard packing boxes (Knebworth SG3)

I've got several heavy duty cardboard packing boxes, the type used by removal firms, available. I reckon about a dozen at present.
These are collapsed so they're flat and easy to transport, don't take up much space etc - to use them you'd need to set them up and tape with brown packing tape.
Estimated size 50cm x 50cm x 70cm (though I could be wrong) - I imagine it's a standard size.