Honestly the only thing you really need to look for when purchasing something on Amazon is who/whom it's "Shipped and sold by", just underneath the part where it says amount in stock. Check the seller ratings and that should answer your question if it should be trusted. That's what I always do when purchasing SM items
As for why it says "Nintendo", it may just be when a seller had created the listing they chose the wrong category/company?
But these don't look off to me. The sellers have good ratings!
I hope this helps a bit!