Initial post was with with a grain of salt if I need to explain that to you :D Still I got your point ;)

More or less it would if you leave it ~50% charged when you put it into the box :) Degradation should not be noticeable. iPhone 12 was introduced in 2020 and still is sold by Apple. Manufacturing date won't be year 2023 and the warranty and battery lifetime should be the same as you've bought it in 2020.

1.5 year and only 6% degradation and you’re complaining? Do not use your phone and it will be as new in 5 years.