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If you have converted the books after adding the cover and re-add the books all should be well.
An easy way to see if it is safe to delete the cover.jpg file etc. Is to open the book in a viewer (calibre is easiest) and see if the book displays the cover. Not foolproof, but 90%.
One can't help but wonder why you are doing this (deleting .jpg etc) as it seems counter productive. Deleting files standard to all formats could get old real fast IMO and unless you are down to no storage at all will not help in any way?
My advice is to approach this from a different perspective. It is extremely easy to delete all .jpg files in one step. Leave them there until you are absolutely sure you will never need them. Not the best place to apply micro-management skills.
Helen
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