If you find any entries where there is no front art, and there is no packaging and the disc/cart art is the only one that is used (to indicate the entry was made before the new art rule came into effect) you can do an edit to put the cart art into front art. Then post into Listing errors to get the cart art to be removed.
It should be noted in description field for items like this how there was no packaging for the item.
But I think that even games like Longbow FX came in *something* and that should be the front art, with the disc alone in cart art... but finding the correct pictures may be well impossible so if we do find the actual something the disc was in we can add that as the front art as time goes on.