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.
Plate Special 1 x 1 with Hole Through Stud, 3 Bars and 3 Bar HolesDark PurplePart 1941Element 6420218×3
Blue
15 pieces
Plate 2 x 2BluePart 3022Element 4613973 or 302223×10
Plate 2 x 6BluePart 3795Element 379523×3
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×2
Sand Green
10 pieces
Plate Special Round 1 x 1 with Hollow Stud and Underside ClipSand GreenPart 5264Element 65917301 spare in the box×10
Tan
9 pieces
Bar 1L / Stem with 3 Sprouts/ProngsTanPart 68211Element 63241761 spare in the box×3
Plant, Sunflower 2 x 2 with 16 PetalsTanPart 6901Element 6614145×1
Plate 2 x 4TanPart 3020Element 4114309 or 302005×4
Plate 4 x 8TanPart 3035Element 4509897 or 4191103×1
Blue Violet
5 pieces
Plant, Sunflower 2 x 2 with 16 PetalsBlue VioletPart 6901Element 6584690×1
Tile Round 2 x 2 Half CircleBlue VioletPart 5520Element 6635738×4
Dark Blue
5 pieces
Plate Special 1 x 2 Rounded with 2 Open StudsDark BluePart 35480Element 6236571×4
Technic Ball JointDark BluePart 32474Element 6498566 or 6337531×1
Green
4 pieces
Technic Axle and Pin Connector Angled #4 - 135°GreenPart 32192Element 6420635 or 4654507×1
Technic Pin Connector Round 1L [Beam]GreenPart 18654Element 66199851 spare in the box×3
Light Bluish Gray
4 pieces
Brick 2 x 8Light Bluish GrayPart 3007Element 6037399 or 4211391×2
Plate 4 x 6Light Bluish GrayPart 3032Element 4211404×2
Yellow
4 pieces
Technic Axle 3YellowPart 4519Element 6130007×4
Dark Orange
2 pieces
Plate Round 1 x 1 with Solid StudDark OrangePart 6141Element 63157822 spares in the box×2
Bright Light Yellow
1 piece
Headwear Accessory Crown Long with BarBright Light YellowPart 25516Element 65105171 spare in the box×1
Dark Turquoise
1 piece
Brick and Axle Separator v2.0Dark TurquoisePart 96874Element 6254100×1
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.