Quote by The Snapple Cap:
My local gamestop guys have been nice to me in the past, but if that's their policy, try a BestBuy... I know they sell those there.
Otherwise, just set up an amazon account to sell yours as (new), or something similar by EBAY, & take pics to prove it's unopened- charge 85% what it's going for, and just ship it. BestBuy is probably closest to a gamestop, and employees may be more lax, since there's a lot more of them in the store.
Or find some local game shop, so there's no BS rules, and trade it in for a WiiU right in the store. I've got (gamedude) by me (www.gamedude.com), & they also sell stuff like that.