Bloody magpies!

Cutting the grass this morning and discovered a nest pulled out of the Cordyline shrub.  One or two broken eggs in the grass and these four stone cold eggs lying inside a green mossy cocoon type nest.  Saw the Magpies sitting in the hedge yesterday by the Cordyline, guess they were just waiting for their moment.  Too small to be a Robins nest and the eggs are the wrong colour too.  Beyond that I have no idea what sort of bird the belong to.