Then where is epubcheck getting its error message from? Did you try actually unzipping a copy of the epub and manually navigating to the images folder. Perhaps you have left spaces in the file name not properly % escaped and the file name is something like "image 1.jpg"?
Alternatively, the 1 could be a placeholder and the real problem file name is something else. Perhaps look for a png file masquerading as a jpeg (you can tell by the file signature bytes at the top of each file).
With so many images, is this a fixed layout epub or comic book?
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