I don't know if anyone here knows about this and I'm not sure that it's a new policy or not.
Items you purchase through CDJapan will be calculated into the daily and weekly sales data for Oricon music charts,
as long as they are shipped within Japan. This applies to all items available through our website. Please note that
Oricon does not count any data of products that are sent overseas from any shop, and CDJapan is no exception. Every morning, Oricon only collects aggregate sales data of previous day, and they do not collect any personal information of customers.
http://www.cdjapan.co.jp/guide/help/product/oricon