Legally, if it isn't explicitly listed in the return policy you should be able to return it for a full refund regardless just because you "are not satisfied" and want a "full refund." Practically, your going to have to twist some arms and big time them because I don't know Costco's ability to sell a "refurbished" game console, or sell it back to Microsoft. Good luck, but I'm doubting you can do it for a full refund without some hidden "restocking fees" or the return policy's ability to change without notice by management.