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 Gear Rack 1 x 4Light GrayPart 3743Element 374302×8
Tiles Special
14 pieces
Tile Special 1 x 2 Grille with Bottom GrooveBlackPart 2412bElement 241226×2
Tile Special 1 x 2 Grille with Bottom GrooveLight GrayPart 2412bElement 241202×12
Wheels and Tyres
9 pieces
Tyre Technic Racing Large with 'MICHELIN' White PrintBlackPart 32296pr0002Element 4182016×4
Technic Wedge Belt Wheel [aka Pulley]Light GrayPart 4185Element 4100502 or 418502×1
Wheel 62 x 46 Technic Racing LargeMetallic SilverPart 56424Element 4294868 or 4141516×4
Bricks
4 pieces
Brick 1 x 4BlackPart 3010Element 301026×2
Brick 1 x 6BlackPart 3009Element 300926×2
Bricks Sloped
4 pieces
Brick Sloped 45° 2 x 1 with Bottom PinBlackPart 3040bElement 4121966 or 304026×4
Plates Round Curved and Dishes
4 pieces
Plate Round 1 x 1 with Solid StudBlackPart 6141Element 6141261 spare in the box×2
Plate Round 1 x 1 with Solid StudTrans-RedPart 6141Element 6514051 or 62084501 spare in the box×2
Plants & Trees
2 pieces
Plant, Palm Tree Trunk - Short Connector, Axle Hole with 2 Inside ProngsLight GrayPart 6135Element 613502×2
Bricks Round and Cones
1 piece
Brick Round 2 x 2 with Axle HoleLight GrayPart 3941Element 614302 or 394102×1
Stickers
1 piece
Sticker Sheet for Set 8461-1[No Color/Any Color]Part 44900Element 4184428×1
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.