I am very leery of any high end modern American cards coming from China, Taiwan, etc., especially in slabs. What plausible explanation is there for the card ending up in Taiwan in a slab? There are too many stories of third shift counterfeiting from the factories that fabricate so many other products. I would be very concerned that this is a counterfeit item in a slab that slipped out the back door of the factory. Also, fake coins from China are a big news story this year:
https://www.cbsnews.com/news/chinas-...ke-gold-coins/
IMO it is only a matter of time before we start seeing fake modern cards in fake slabs.