If the pictures were posted too briefly, the pages may not have been spidered while the pics were there.
Things like the wayback machine go back a long way, but no closer to the present than a few months ago.
You can try using Google. Put the URL of the page the pictures were on in the search engine. Just below the link to the page you'll see the word "Cached". You can click on that to see the page as it was recently. That may fall in the right time frame.
In the future, when you see a situation like that it's best to archive the page yourself either with a screen shot or by using the save page feature of the browser.
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