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.
Duplo Brick 2 x 2 x 2Medium NougatPart 31110Element 6435628×3
Duplo Brick Round 2 x 2 x 2Medium NougatPart 98225Element 6296138×5
Duplo Brick 1 x 3 x 2 Round Top, Cut Away Sides with Dark Bluish Grey '1' PrintPearl GoldPart 14222pr0019Element 6420879×1
Duplo Brick 1 x 3 x 2 Round Top, Cut Away Sides with Dark Bluish Grey '2' PrintPearl GoldPart 14222pr0020Element 6420880×1
Duplo Brick 1 x 3 x 2 Round Top, Cut Away Sides with Dark Bluish Grey '3' PrintPearl GoldPart 14222pr0021Element 6420891×1
Duplo Brick Round 4 x 4 Dome Top with 2 x 2 Studs with Black Face, Sleeping, Yellow Seeds PrintRedPart 98220pr0007Element 6519721 or 6420876×1
Duplo Cone (Elliptic Paraboloid) 4 x 4 x 2 1/2, InvertedRedPart 1962Element 6435620×1
Duplo Bag with Radishes, Lemons, Strawberries, and Watermelon PrintWhitePart 101784pr0001Element 6420909×1
Duplo Brick 2 x 3 with Curved TopWhitePart 2302Element 6172232 or 6004947×2
Duplo Brick 2 x 4 x 2 Curved Top with Gauge, Bees PrintWhitePart 31213pr0034Element 6420878×1
Duplo Brick 2 x 4 x 2 Curved Top with Lime 'Organic MARKET' PrintWhitePart 31213pr0035Element 6420877×1
Duplo Brick Round 4 x 4 x 1 1/2, Curved BottomWhitePart 1970Element 6425542×1
Duplo Plate 2 x 8WhitePart 44524Element 4563575×1
Duplo Plate 8 x 8WhitePart 51262Element 6404744 or 6343498×1
Duplo Brick 2 x 4 Curved Bottom with Bright Light Orange Dots PrintYellowPart 98224pr0013Element 6420873×1
Duplo Brick 2 x 4 x 2 Curved Top with Face, Closed Eyes, Green Leaf PrintYellowPart 31213pr0037Element 6420872×1
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.