I'm sorry to hear that. If there were a way to shove cardboard up Nintendo's ass, I'd advise you on how to do it...
Just sell it used and get the bulk of your money back. Don't let Nintendo get away with this.
Looking at the CEX site, you can sell the games but the cardboard 'peripherals' can only be sold if the box is sealed. Unsurprising really. Not really much point is the things are already built, and as its cardboard it's far to easy to damage when using so would be almost worthless otherwise second-hand.