[From the questions: What do I do if my set is missing parts? Where can I get replacement parts? One of my pieces is damaged, what do I do?]
Despite the best efforts of those who are responsible for the manufacture of LEGO sets, there is sometimes an item missing or damaged in your set. It could be an individual LEGO piece; it could be the instructions or the sticker sheet. LEGO are aware this happens. That’s one of the reasons they include extras for the little pieces – they know the parts are easy to lose. They also have changed their packaging so the stickers and instructions are better protected whilst in the box.
Things can still be damaged or missing, though, so LEGO has a service via their website from where you can order replacement parts. The pieces will be replaced free of charge but we recommend that you only use the service if you have a genuine missing or damaged part. Do not abuse the service.
Some parts will not be available via the LEGO replacement parts service, even though they may be from a new set. If that is the case, you may have some luck purchasing what you need from either Bricklink or Brick Owl. It would also be worth trying members of your local LUG or a local LEGO buy/sell/swap/trade group on Facebook. You can also purchase individual or bulk parts directly from the LEGO online store – either from their Bricks and Pieces selection or via their online Pick a Brick site.