I hadn't thought of a game possibly not working. Won't they exchange it if it's defective?
most places only have a very short window for opened games (some as little as 72 hours) and since the only way you can tell if it's defective is to open it then you have to wait for the more generous return periods on electronics (i wait until gamestop starts their holiday return period but i always have to verify ahead of time that corporate has done it for both in-store and online b/c they don't always start on the same day).