The thumbnail pages will have file names generated from the category name combined with an (internally generated) id number and the page number. The id number is necessary as the category name is not necessarily unique - it may be re-used elsewhere in the category tree. Depending on your setting of the rows_and_cols command any given category may require multiple pages this will be the last part of the generated file name. These page numbers are available through the thumbnail_page_no and total_thumbnail_pages commands.
The image page file names are generated in a similar way.
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