Papaver argemone has hairy seed cases. This plant keys to Papaver dubium in both Plantnet and VicFlora, but does not look like it. I am more inclined to think it is some other cultivar come up again.
I see what you mean, so I have made a new suggestion based on your better judgement, and changed the photos a bit. There are a few varieties to the species, for example Papaver dubium var. albiflorum, see: http://www.panoramio.com/photo/105390712
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