To explain our scan:  the cardboard cover for this set of four maximum cards issued on 12 January 2022 starts with the purple section of the scan’s lower right corner.  Other space is taken up with three of the four cards; the other one is of similar design.  The set was issued by Chunghwa Post Co. and the otherwise unused cards have Chinese and English captions.  The full title on the cover is “Maximum Cards of Jade Articles from the National Palace Museum Postage Stamps (Continued III)” so you can also source out I and II.  Grade: 1