Paul Hsu may be able to differentiate, but I think the average consumer like me is not going to be able to visually differentiate between wild simulated and truly wild grown dry ginseng. I may not even be able to taste the difference. My only vague gauge for measuring good ginseng is the level of kumness...(gan/kum is the chinese word/description for the clean dry/bitter taste of ginseng or other herbs).
Chinese grown American ginseng is unnaturally sweet, while Wisconsin ginseng has a rather distintive fragrance, which is similar for cultivated, wood-grown and wild. But I think Ginseng from other regions will have slightly different levels of kumness/sweetness to it.
Anyway ginseng trade is largely based on trust. Consumers buy such high value roots only from trusted supplier/medical shops.