Excellent photos showing important diagnostic characteristics. The whole mushroom is fleshy, which is typical; the gills are crowded; free, that is they aren't attached to the stipe but have curved into the cap, though very close to the stipe. If they'd been attached to the stipe part of them would have broken away when you snapped the stipe off and thus there wouldn't have been a clean break. The colour, milk chocolate indicates spores are maturing (when immature the gills may be very pale or pink), when mature may be a dark chocolate brown to almost black; the stem (stipe) cleanly separates from the cap as mentioned. The texture of the cap surface is fibrous, ie composed of a dense mass of fibrils (minute hairs or small fibres). Nice looking specimen, hard to say if it's the same as they one you posted yesterday which had a definite indentation on the centre of the cap and splits in the cap surface towards the outer half. There are many Agaricus species in Australia not all have been identified. So unless distinctive feel it's safer just to stick with the genus.
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