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.
LEGO's request form asks for the set number (6581678) and each piece's element ID, both listed above.
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Clear every mark for this set?
Piece checklist
Plants & Trees
17 pieces
Plant, Flower, Plate Round 1 x 1 with 5 PetalsBright Light BluePart 24866Element 6209683×1
Plant, Flower, Plate Round 1 x 1 with 5 PetalsBright Light OrangePart 24866Element 6209681×1
Plant, Flower, Plate Round 1 x 1 with 5 PetalsBright PinkPart 24866Element 6212501×1
Plant, Flower, Peony Rose with 2 LayersDark PinkPart 5904Element 6550578 or 6513737×1
Plant, Plate 1 x 1 Round with 3 LeavesGreenPart 32607Element 6229130×3
Plant, Flower, Plate Round 1 x 1 with 5 PetalsMedium LavenderPart 24866Element 6209684×1
Plant, Flower, Peony Rose with 2 LayersOrangePart 5904Element 6550815 or 6515227×1
Plant, Flower, Peony Rose with 2 LayersRedPart 5904Element 6550575 or 6512571×1
Plant, Flower, Plate Round 1 x 1 with 5 PetalsRedPart 24866Element 6206148×1
Plant, Flower, Plate Round 1 x 1 with 5 PetalsReddish OrangePart 24866Element 6475523×1
Plant, Flower, Plate Round 1 x 1 with 5 PetalsWhitePart 24866Element 6206149×1
Plant, Sunflower 2 x 2 with 16 PetalsYellowPart 6901Element 6509767×4
Tile Round 1 x 1Dark OrangePart 98138Element 6322840×4
Bricks Round and Cones
3 pieces
Brick Round 1 x 1 with 3 BarsDark GreenPart 6331Element 6525927×1
Brick Round 2 x 2 with Axle HoleTrans-Light BluePart 3941Element 6514282 or 6273153×2
Plates Round Curved and Dishes
1 piece
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)WhitePart 4032aElement 6601914 or 403201×1
Plates Special
1 piece
Plate Special Round 2 x 2 with Center Stud (Jumper Plate)Light AquaPart 18674Element 6393567 or 6311316×1
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.