I just bought the Grey's Anatomy video game for the Wii from HMV and I've just been to pick it up and I can't open it.

When I try opening the cover it won't let me because there is like a square brown block wedged in. I tried pushing it but it didn't work. I was going to try and scrape it out with something sharp but it'll break the cover. This is so annoying!
Note: I'm referring to the game packaging.