非公開- ("Hikokai")- private. Sometimes then you check the auction results, instead of sold price you will see the note saying 非公開. It means, that the owner of this car for some reason did not want to show the sold price to public. The real sold price in that case will be known by seller, purchaser and auction only. The reason should be weighty. However, not all action groups allow above schema, for instance USS Group will not allow, not to show the sold price.