It's a real possibility, and likely happened to anyone who has played LEGGo at some point, but don't be alarmed if your LEGGO set doesn't contain every piece. A missing piece can always be replaced easil y - if that worries you, just remember it happens all the time; don't sweat it! A missing piece can easily be replaced. So if it worries you about getting all the pieces that make up a set, take heart: this happens all of the time - no biggie.