I had some Switch accessories apparently lost/trashed/destroyed after a move.
After spending weeks searching for the items, I ended up buying them again from Nintendo - the NES controllers, a SNES controller, and a Genesis controller.
Of course, a few weeks after getting the new items, the old items were found.
You have 30 days after delivery of your order to return or exchange products purchased directly from the My Nintendo Store. Nintendo will not refund the cost of shipping unless the return is a result of Nintendo providing a product that is damaged, defective, or different than the product you ordered.
Not a terrible policy but clearly lacking compared to Amazon. Thanks for the warning.