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That's not really possible. If they were showing in the Book Browser when the EPUB was saved ... then the images were saved with the EPUB.
The only possible exception to this would be if you're using a Mac and you're in the habit of leaving EPUBs open in Sigil for more than 48 hours (and since your initial post was made way less than 48 hours ago ... I'm dismissing this scenario as highly improbable).
Make absolutely certain the EPUB you're saving is the EPUB you're re-opening. Also make sure you're not meddling with files in Sigil's scratch/temp directory while Sigil has the EPUB open.
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