Each of the unique files is a Zip archive containing the image plus an XML file. The only thing I can think of is to check the contents of each zip file to look for duplicate images. You can do this manually (sort the directory by file size and only look at zips that have identical file sizes) or using a zip content comparator:
https://www.ultraedit.com/support/tutorials-power-tips/ultracompare/compare-zip-rar-and-jar-archives.html
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