that’s literally what i said on the reply above
you can post anything on-sale that is in violation of gameflip terms of service, but you are screwed if someone report or if you just ask gameflip support to help with your listings
i just asked first to be sure, i though i would get a quicker response about the TO DO/NOT TO based on previous experiences instead of searching by myself but i just got “you can only sell what is listed as allowed”