The thumbnails will only exist IF you have created a Catalog that has needed them beforehand.
These are NOT maintained automatically. If you change a cover, you need to create another catalog to update the thumbnail
Preferences: Miscellaneous:open the Calibre Configuration folder
should get you close
No Reader. Do they have a Windows PC/MAC/Linux PC or smart phone with a WEB browser?
The content server (covers) can be used with almost any Internet Browser capable of showing pictures
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