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.
Technic Axle and Pin Connector Angled #3 - 157.5°RedPart 32016Element 6261396 or 6176754×2
Technic Axle and Pin Connector PerpendicularRedPart 6536Element 6261373 or 4188298×2
Technic Axle and Pin Connector Perpendicular Double SplitRedPart 41678Element 4173975×2
Technic Beam 1 x 2 ThickRedPart 43857Element 4185664×2
Technic Beam 1 x 2 with Ball Joint AngledRedPart 50923Element 6464980 or 6194067×2
Technic Beam 1 x 3 ThickRedPart 32523Element 4153718×2
Technic Beam 3 x 3 T-Shape ThickRedPart 60484Element 6194079×1
Technic BushRedPart 3713Element 6271820 or 42271551 spare in the box×2
Technic Panel Fairing #21 5L Small Smooth, Side BRedPart 11946Element 6340601 or 6022750×1
Technic Panel Fairing #22 5L Small Smooth, Side ARedPart 11947Element 6343986 or 6022752×1
Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Big Squared Pin Holes]RedPart 87082Element 6168687 or 4560172×1
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]RedPart 41669Element 4185661×2
Tile Special Round 1 x 1 with Hollow BarRedPart 20482Element 6215539 or 61888271 spare in the box×1
Black
15 pieces
Large Figure Limb Cover, Armor with Ball Joint Socket and 2 Holes [Plain]BlackPart 26831Element 6160104×2
Large Figure Skeletal, Limb with Ball Joint on Axle and Ball SocketBlackPart 90607Element 4593553×2
Large Figure Skeletal, Limb, 5L with Ball Joint on Axle and Ball SocketBlackPart 90609Element 4593555×2
Large Figure Skeletal, Torso with Beam and 4 Ball JointsBlackPart 24010Element 6135323×1
Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle)BlackPart 6553Element 4107765 or 655326×2
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleBlackPart 32184Element 6276951 or 4121667×2
Technic Beam 1 x 2 with Ball Joint Straight, Smooth BallBlackPart 64276Element 4560108 or 4537514×1
Technic Pin with Friction Ridges Lengthwise and Center SlotsBlackPart 2780Element 4121715 or 2780261 spare in the box×3
Blue
10 pieces
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×3
Technic Pin 1/2 without Friction RidgesBluePart 4274Element 41430051 spare in the box×5
Technic Pin Long with Friction Ridges Lengthwise, 2 Center SlotsBluePart 6558Element 4514553×2
Dark Bluish Gray
8 pieces
Large Figure Skeletal, Joint Extender [High Friction]Dark Bluish GrayPart 74261Element 6314448 or 6106472×4
Large Figure Skeletal, Limb with Ball Joint, and Ball Socket and HoleDark Bluish GrayPart 90616Element 6168746 or 4655899×2
Large Figure Skeletal, Limb with Ball Joint, and Ball Socket and Two HolesDark Bluish GrayPart 90615Element 6121358 or 6014042×2
Flat Silver
4 pieces
Large Figure Weapon Blade, with Bar Holder and AxleFlat SilverPart 32662Element 6194130×2
Technic Pin Connector Round [Slotted]Flat SilverPart 62462Element 6245499 or 6054858×2
Light Bluish Gray
4 pieces
Technic Axle 5Light Bluish GrayPart 32073Element 32073194 or 4211639×4
Tan
2 pieces
Technic Pin Long without Friction RidgesTanPart 32556×2
Trans-Red
2 pieces
Bar 4L (Lightsaber Blade / Wand)Trans-RedPart 30374Element 6507880 or 6167284×2
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.