Commonly artistic items of game sets would be made for largely show purposes and rarely or never used. So it wouldn’t be surprising if it was made and then sealed in a box for a funeral wealthy collection or storage. We still do that with fancy metal dice that most people will never roll.
If they’re in a group with other humans. If you grow up without language like child raised by wolves then you just miss out on language completely and it’s very hard to impossible to learn later once your special infant brain language tool is gone.