Bronze Coins Buried In A Ceramic Jar

In 2018, archaeologists unearthed a 15th-century ceramic jar full of bronze coins at a residence belonging to a samurai just north of Tokyo. The coins were most likely acquired over time through trade, as they were from different regions and periods. The exact reason why the jar was buried remains a mystery.
I'm wondering, if s/o writes:
"Faaaake - how can it be?
The US exist since 1776-07-04 ! Nothing can be before!
Don't be a woke leftist, do your own research, touch some grass and never trust science or the universities!"
Bomb! What the fuck?