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29 August 2018
Emily, Customer ServiceThanks for your review! There is one lighter gray 2x2 plate in this set, used in step #59 on page #62. You might want to double-check that your missing dark gray didn't accidentally get swapped into that spot. If not, then we're happy get the right piece on its way to you. You can request it by going to LEGO.com/Service and choosing the "Bricks & Pieces" option.