Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece
and leave with the element ID LEGO asks for, or a link to buy the part.
292 pieces in 155 part and color combinations, plus 2 minifigures.
LEGO counts 300 pieces. This inventory comes from a separate parts catalog and lists 301, including the 9 parts inside the minifigures; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.
Before you call it missing
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Headwear Accessory Crown / TiaraPearl GoldPart 33322Element 6605929 or 61731091 spare in the box×1
Rock
1 piece
Rock 1 x 1 Jewel / Gem 24 FacetTrans-YellowPart 30153Element 6513974 or 62477951 spare in the box×1
Stickers
1 piece
Sticker Sheet for Set 43188-1[No Color/Any Color]Part 75285Element 6331076×1
Supports, Girders and Cranes
1 piece
Support 1 x 6 x 5 Girder RectangularReddish BrownPart 64448Element 6470025 or 6002837×1
Technic Axles
1 piece
Technic Axle 5 with StopReddish BrownPart 15462Element 6159763×1
Technic Connectors
1 piece
Technic Pin Connector Round [Slotted]WhitePart 62462Element 6550164 or 6173116×1
Technic Pins
1 piece
Technic Pin 1/2 without Friction RidgesLight Bluish GrayPart 4274Element 4274194 or 42114831 spare in the box×1
Minifigures
2 figures
Aurora - Dark Pink Dress, Dark Azure/Blue DecorationsMinifigure, checked as a whole figure×1
Maleficent - Dark Purple CapeMinifigure, checked as a whole figure×1
Tick each piece as you find it, or mark it missing.
When a piece really is missing
Ask LEGO
LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for
the set number and each piece's element ID, the number printed beside the piece in the parts list at the back
of the instructions. This checker lists both.
Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from
older or second-hand sets.
Keep a record
Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick
pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.