Mademoiselle Ai 528Hz MI Tuner 528Hz Dedicated Tuning Fork Box (with Hammer)

Purchased from Mademoiselle Ai's official shop several years ago. Used occasionally for about six months, it is in very clean condition with no noticeable scratches. The dedicated tuning fork box was taken out of its bag for photography, but has never been used.
The textbook is not in the best condition due to storage, so please consider it as a bonus. Please judge from the photos.

[Product Description]
◯528Hz MI Tuner
Body: MI Tuner 528Hz, Aluminum Tuning Fork
With serial number
¥13,500 (tax included)
Specifications: Weight 68g, Length 19.5cm, Width 2.5cm
Vibration duration: Approximately 1 minute

◯528Hz MI Tuner Dedicated Tuning Fork Box

528Hz Normal Type Tuning Fork Box
¥10,000 (tax included)
Compatible Tuners: 528Hz Normal Tuner, Deep Sea 528Hz Tuner, Mirror Finish 528Hz Tuner, 528Hz Tuner from Solfeggio 6-Tone Set

The tuning fork box amplifies the sound of the tuning fork, increasing its volume. The resonance size is determined by the frequency, so each tuning fork box is dedicated to a single frequency.
This tuning fork box is for 528Hz only.

◯Mini Hammer ¥1,200 (tax included)