In July and August 2016 Ebay seller tanamsang from Chiangrai in Thailand was trying to sell these China taxi plates.
He is selling them as authentic and used.
They are neither of these being very poor quality copies of Chinese private vehicle plates.
They are made of steel not aluminium, they are flat not embossed, the colour is wrong, the stickers are very poorly applied and there are no special taxi plates in Beijing.
This is just scrap steel at a very high price.