Exactly, it’s not on Nintendo to fix, this could be happening anywhere in the chain.

Could be within the stores or their suppliers, or it could be returns from end-customers.

My personal bet would be scammers buying games with cash, taking the games and then shrink-wrapping the box before returning them for a cash refund. And then they flip the cartridges on eBay or whatever.

My strategy is to not look at work emails outside work time.

You can neither attend nor be stressed about a meeting that occurs earlier than you start work, if you don’t know it exists.