[Tao_Moko]

Since it was determined authentic as a blank back by the grader than it would seem reasonable that there would be either notes or grading criteria checklists that could be referenced(thickness, coloration, residue, scuffing, tears, etc.) from it's raw form. This is most likely a 1/1 of a high profile non-S/Ler and it's back and rarity are in question. Perfect opportunity for the tpg to step up and offer some details.

Just to beat the horse for a second:

I'm not in favor of numerical grades due to the lack of controls and human judgement but I am in favor of tpg authentication. A card that could be one-of-a-kind should come with evidence of it's authenticity.