box inscription; authentication note on a box
Refers to an autograph, signature, or authentication note written on the box (usually a wooden storage box) that contains an artwork, such as a tea bowl, hanging scroll, or ceramic piece. Common in art and antique contexts.
The box inscription on this tea bowl is by a famous tea master.
Having a box inscription often increases the value of an artwork.
Compound of 箱 (hako, 'box') and 書き (kaki, 'writing'). The term straightforwardly describes writing on a box.