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.
507 pieces in 154 part and color combinations, plus 3 minifigures.
LEGO counts 520 pieces. This inventory comes from a separate parts catalog and lists 521, including the 14 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.
Technic BushRedPart 3713Element 6271820 or 42271551 spare in the box×4
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]RedPart 32054Element 4140806 or 4125198×4
Reddish Brown
11 pieces
Plate 2 x 3Reddish BrownPart 3021Element 4211189×11
Trans-Orange
9 pieces
Plate Round 1 x 1 with Solid StudTrans-OrangePart 6141Element 6514059 or 62402271 spare in the box×8
Tile 1 x 2 with GrooveTrans-OrangePart 3069bElement 6514225 or 6251306×1
Medium Nougat
6 pieces
Animal Body Part, Dinosaur, Tyrannosaurus Rex Body with Reddish Brown and Dark Orange Skin PrintMedium NougatPart 98160pr0003Element 6223585 or 6115650×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Head with Pin, White Teeth, Dark Orange Top and Dark Brown Stripes PrintMedium NougatPart 98161pr0003Element 6223557 or 6115654×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Leg, Left, with Pin, Dark Orange and Reddish Brown Markings PrintMedium NougatPart 98162pr0003Element 6223691 or 6115678×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Leg, Right, with Pin, Dark Orange and Reddish Brown Markings PrintMedium NougatPart 98163pr0003Element 6223692 or 6115682×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Lower Jaw with White Teeth PrintMedium NougatPart 98057pr0003Element 6223571 or 6115656×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Tail, with Pin, Reddish Brown and Dark Orange Stripes PrintMedium NougatPart 98159pr0003Element 6223647 or 6115622×1
Trans-Yellow
6 pieces
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]Trans-YellowPart 2654Element 6581773 or 6171728×2
Tile 1 x 2 with GrooveTrans-YellowPart 3069bElement 6514221 or 6251291×2
Tile Round 1 x 1Trans-YellowPart 98138Element 6514193 or 62747401 spare in the box×2
Flat Silver
3 pieces
Technic Axle and Pin Connector, Perpendicular with ExtensionFlat SilverPart 53586Element 6395637 or 6323657×2
Vehicle Base, Motorcycle Chassis, Long Fairing MountsFlat SilverPart 50859bElement 6055651×1
Dark Orange
2 pieces
Animal Body Part, Dinosaur, Tyrannosaurus Rex Arm / Leg, Left, Small, Black Claws PrintDark OrangePart 98058pr0003Element 6258455 or 6234164×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Arm / Leg, Right, Small, Black Claws PrintDark OrangePart 98059pr0003Element 6258459 or 6234173×1
Lime
2 pieces
Equipment Medical SyringeLimePart 87989Element 6086765 or 46545832 spares in the box×2
Trans-Brown
2 pieces
Windscreen 2 x 4 x 2Trans-BrownPart 3823Element 6253684 or 4167504×2
Trans-Red
2 pieces
Tile 1 x 2 with GrooveTrans-RedPart 3069bElement 6514220 or 6251290×2
Dark Brown
1 piece
Equipment Telescope / Torch / Spyglass, Support Round 1 x 1 x 1 2/3Dark BrownPart 64644Element 4538950×1
Orange
1 piece
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Trans-Bright Green
1 piece
Projectile, Bar 8L with Black Arrow End (Spring Shooter Dart)Trans-Bright GreenPart 19020Element 6121062×1
Trans-Dark Blue
1 piece
Cone 1 x 1 [Top Groove]Trans-Dark BluePart 59900Element 6514018 or 6301313×1
Trans-Neon Orange
1 piece
Flame / Headwear Accessory Plume / Feather, Triple PointTrans-Neon OrangePart 64647Element 6289248 or 61000331 spare in the box×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 75918-1[No Color/Any Color]Part 21370Element 6115946 or 6115945×1
Minifigures
3 figures
Vet with Fedora Hat, SternMinifigure, checked as a whole figure×1
Vic HoskinsMinifigure, checked as a whole figure×1
ACU Trooper with Sand Blue Armor, FemaleMinifigure, 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.