Any requirement to report taxes on sold goods?

A few months ago I sold my years worth collection of Pokemon cards. the total ended up being relatively high, 1,650,000 JPY.

Asking around, it seems like this is a "grey area" in terms of reporting. I've also been told that there is even a minimum of 2M before I need to worry about reporting.

Usually I would just leave it at that, however this year I am planning to apply for PR and I know they take a look at tax payments and I would like to avoid any questions about where the money came from etc., Would this amount of money be something immigration becomes curious about and delay or even risk my PR application getting denied if I don't report and pay taxes on it?

by Sush1Samurai