The cover image files for books have always been removed correctly ever since I got my Glo (fw 2.1.5), but there may be other cover images associated with recommendations, and often the recommendations are for the same books that were sideloaded, so it might appear that there are still cover images for the deleted book when in fact they are for the recommendation which is still in the database.
There were some firmware versions where old recommendations did not get deleted, I discovered I had a couple of thousand cover images associated with old recommendations at one point. But you can use Calibre to delete the old recommendations, and they seem to be getting deleted automatically in the current 3.x.x firmwares.
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