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.
957 pieces in 229 part and color combinations, plus 5 minifigures.
LEGO counts 973 pieces. This inventory comes from a separate parts catalog and lists 984, including the 27 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.
Brick Wedged, Sloped 4 x 2 Triple LeftWhitePart 43710Element 6552155 or 6106685×1
Brick Wedged, Sloped 4 x 2 Triple RightWhitePart 43711Element 6552154 or 6106683×1
Brick Wedged, Sloped 45° 2 x 2 CornerWhitePart 13548Element 6601847 or 6056447×6
Brick Wedged, Sloped 45° 3 x 3 LeftWhitePart 42862Element 6552173 or 6254601×1
Brick Wedged, Sloped 45° 3 x 3 RightWhitePart 48165Element 6552174 or 6254602×1
Bricks Curved
44 pieces
Brick Curved Inverted 4 x 1BlackPart 13547Element 6039869×2
Brick Curved 1 x 2 x 1 1/3 with Curved TopLight AquaPart 6091Element 6411361 or 6097304×10
Brick Curved Inverted 2 x 1Light AquaPart 24201Element 6336530 or 6138663×2
Brick Curved 4 x 1 Double, No StudsRedPart 93273Element 4633914×1
Brick Curved 1 x 1 x 2/3 Double Curved Top, No StudsReddish BrownPart 49307Element 6371437×2
Brick Curved 2 x 1 No Studs [1/2 Bow]Sand BluePart 11477Element 6179812×4
Brick Curved 2 x 2 x 2/3Sand BluePart 15068Element 6166865×2
Brick Curved 2 x 1 No Studs [1/2 Bow]WhitePart 11477Element 6552145 or 6548276×12
Brick Curved 2 x 1 with Inverted CutoutWhitePart 78666Element 6550186 or 6346616×2
Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges]WhitePart 11153Element 6578744 or 6564905×2
Brick Curved Inverted 2 x 2 x 2/3WhitePart 32803Element 6210385×5
Animal / Creature Body Parts
39 pieces
Creature Body Part, Dragon Head Upper Jaw with Spikes with Trans-Light Blue Pattern and Dark Blue Eyes, Medium Blue Markings PrintLight AquaPart 100588pat0001pr0001Element 6421029×1
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, SmallPearl GoldPart 53451Element 6270109 or 46181951 spare in the box×2
Animal Body Part, Horn Stacked 45 deg. with Axle ConnectorsPearl GoldPart 2142Element 6417338×2
Creature Body Part, Barb Large (Claw, Talon) with ClipPearl GoldPart 16770Element 6293489 or 6141591×18
Animal Body Part, Skull, CattleRedPart 13695Element 6421596×1
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, MediumWhitePart 87747Element 6270092 or 46139411 spare in the box×6
Animal Body Part, Horn (Cattle)WhitePart 64847Element 6328195 or 63101971 spare in the box×2
Creature Body Part, Dragon Head Upper Jaw with 2 x 4 Studs, BarsWhitePart 2169Element 6422996×1
Insect Body Part, Leg / Tail / Tentacle / ClawWhitePart 15064Element 6359811 or 6310195×6
Technic Special
39 pieces
Technic Brick Special 2 x 2 with Pin Hole, with 2 Rotation Joint SocketsBlackPart 48172Element 6296186 or 4275826×1
Rotation Joint Socket with 2 PinsDark Bluish GrayPart 80563Element 6369944×2
Technic Brick 1 x 2 with Hole and Dual Beam ExtensionsDark Bluish GrayPart 85943Element 6324639 or 4547958×4
Technic Brick Special 2 x 2 with 10.2mm Balls with Holes and Axle HoleDark Bluish GrayPart 17114Element 6065816×2
Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Ball Half [Vertical Side]Dark Bluish GrayPart 48171Element 6492115 or 6343337×4
Technic Rotation Joint Disk with Pin and Double Rotation Joint Ball HalfLight Bluish GrayPart 79505Element 6372460×2
Technic Tooth 1 x 3 with Axle Hole [Hollow Underside]Pearl GoldPart 48267Element 6385549×6
Technic Brick Special 2 x 2 with Ball Socket Wide and Axle Hole, No Arm HolesWhitePart 67696Element 6360826×10
Technic Brick Special 2 x 2 with Ball and Axle Hole, with 6 Holes in BallWhitePart 57909bElement 6307640 or 6146939×6
Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint SocketWhitePart 48169Element 6328452 or 4218483×2
Technic Pins
33 pieces
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L AxleBlackPart 18651Element 6089119×4
Technic Pin with Friction Ridges Lengthwise with No Center SlotsBlackPart 61332Element 62798751 spare in the box×10
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×4
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole]Pearl GoldPart 65304Element 6593341 or 6287672×4
Technic Pin 1/2 with 2L Bar ExtensionRedPart 61184Element 6350694 or 4526119×1
Technic Pin 1/2 with FrictionRedPart 89678Element 63781201 spare in the box×2
Technic Rotation Joint Ball Loop with Two Perpendicular Pins with FrictionWhitePart 47455Element 6352203 or 4298040×8
Plates Round Curved and Dishes
32 pieces
Plate Round 6 x 6 with HoleDark TanPart 11213Element 6166127×1
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)Medium AzurePart 4032aElement 6109752×3
Plate Round 1 x 1 with Open StudPearl GoldPart 85861Element 6190252 or 61414991 spare in the box×5
Plate Round Corner 3 x 3 with 2 x 2 Round CutoutWhitePart 68568Element 6552185 or 6339103×2
Plate Round Corner 5 x 5 with 4 x 4 Round CutoutWhitePart 80015Element 6399559×2
Plate Round Corners 2 x 6 DoubleWhitePart 18980Element 6147792×2
Plate Special 1 x 2 Rounded with 2 Open StudsWhitePart 35480Element 6552167 or 6550175×17
Technic Connectors
30 pieces
Technic Axle and Pin Connector PerpendicularBlackPart 6536Element 6261371 or 4173668×2
Panel 1 x 2 x 2 [Side Supports / Hollow Studs]Trans-Light BluePart 87552Element 6581813 or 6253230×1
Stickers
1 piece
Sticker Sheet for Set 71786-1[No Color/Any Color]Part 10102073Element 6422677×1
Tools
1 piece
Brick and Axle Separator v2.0Dark TurquoisePart 96874Element 6254100×1
Minifigures
5 figures
Zane - EVO, Wraps, Shoulder GuardMinifigure, checked as a whole figure×1
P.I.X.A.L. - EVOMinifigure, checked as a whole figure×1
Bone King - Cape, Crossed BonesMinifigure, checked as a whole figure×1
Bone KnightMinifigure, checked as a whole figure×1
Bone WarriorMinifigure, 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.