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.
Tile 1 x 2 with GrooveBlackPart 3069bElement 306926×2
Tile 2 x 2 with GrooveBlackPart 3068bElement 306826×2
Tile 1 x 2 with GrooveDark RedPart 3069bElement 4539090 or 4529548×2
Bars, Ladders and Fences
4 pieces
Bar Holder with Hole and Bar HandleDark Bluish GrayPart 23443Element 6397633×2
Bar Holder with Hole and Bar HandleLight Bluish GrayPart 23443Element 6343976 or 6152107×1
Bar, Angled with 1 x 1 Round Plate / Stud on EndTrans-ClearPart 65578Element 6510188 or 62855871 spare in the box×1
Bricks
4 pieces
Brick 1 x 1BlackPart 3005Element 300526×2
Brick 2 x 2 CornerBlackPart 2357Element 235776 or 235726×2
Hinges, Arms and Turntables
4 pieces
Hinge Plate 1 x 4 Swivel Top / Base - Hollow Clip [Complete Assembly]BlackPart 1927Element 6672302 or 6416444×4
Technic Pins
4 pieces
Technic Pin with Friction Ridges Lengthwise with No Center SlotsBlackPart 61332Element 62798751 spare in the box×2
Technic Rotation Joint Ball Loop with Two Perpendicular Pins with FrictionBlackPart 47455Element 4272426 or 4213374×2
Large Buildable Figures
3 pieces
Large Figure Shoulder Cover, Armor, Round, Smooth with BarDark RedPart 1686Element 6593279 or 6510983×2
Large Figure Face 4 x 5 x 1 2/3 with Helmet, Red Visor, Dark Red Stripes (Ant-Man) PrintFlat SilverPart 85834pr0006Element 6488500 or 6433841×1
Bricks Round and Cones
1 piece
Brick Round 2 x 2 with Axle HoleRedPart 3941Element 614321 or 394121×1
Minifigs
1 piece
Minifig Trophy Statuette, The Wasp PrintBlackPart 90398pr0060Element 6433840×1
Transportation - Land
1 piece
Wheel Arch, Mudguard 2 x 3 x 1 1/3 with 2 x 2 PlateBlackPart 49097Element 6255875×1
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.