2 notes having the same pitch

I just unboxed my 30 note music box and I wrote a simple song, but when I played it through the first time, one of the notes didn't play. I then used a paper clip to see if I had incorrectly punched the hole, but it did play. I started to see if this was the case for all of the notes and I found that the note just a half step above is the same pitch as the one that couldn't play. I don't know how to fix this problem. I don't have a screwdriver to get it out of the box.