As it was packaged at the time of purchase, it has been stored for about 15 years (opened once for content verification). The reflection of the foil is beautiful, and the mushrooms stand out.
In the United States, it is typically traded for around $8,000 and recently (in 2023) has gone up to $9,850 (about 1.35 million yen). See photos 9-10. It is expected that its value will continue to rise in the future.