The picture gave it away for sure, it's just way too smooth, all the chisel marks have been filled in with something to make the texture more uniform. It's strange though, to use the term sinking for something that's been resin pressed. By that logic anything with metal inside it would also be considered sinking
But Etsy's turning into a weird place these days, if you scroll through some of the recs you'll find a seller advertising clearly cultivated kinam as "Wild" with a price of 38 USD/gram 🤦♂️