Part of the probem with your ad is that you posted the unkown pads resting on a Hawk box. Although you were up front in the ad about not knowing the brand/compound, a newbie might see the box and presume they were actual hawks.
If you cannot identify the brand or compound, you can re-list with pics of the pads without any packaging in the pic and, once again, indicate the year of your car from which it was removed (and it would help if you identify if you had stock calipers, etc when removed) and state simply brand/compound unknown.