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.
606 pieces in 273 part and color combinations, plus 6 minifigures.
LEGO counts 639 pieces. This inventory comes from a separate parts catalog and lists 640, including the 34 parts inside the minifigures; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.
Before you call it missing
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Look-alike colors in this set
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color,
check whether it went in where the other color belongs. Each color has its own element ID in the parts list
at the back of the instructions.
Brick Round 1 x 1 Open StudWhite ×1Trans-Clear ×1Trans-Clear is see-through: hold the piece up to a light.
Brick Sloped 30° 1 x 2 x 2/3Reddish Brown ×1Dark Brown ×5Reddish Brown is redder and lighter than Dark Brown.
Plate 1 x 4Reddish Brown ×4Dark Brown ×1Reddish Brown is redder and lighter than Dark Brown.
Brick 2 x 2 CornerTan ×5Dark Tan ×1Tan is lighter than Dark Tan.
Plate Special 2 x 2 with Groove and Center Stud (Jumper)Tan ×1Dark Tan ×3Tan is lighter than Dark Tan.
Bar 3LBlack ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
1 more look-alike pair
Plate 2 x 8Black ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate Round 1 x 1 with Solid StudYellowish GreenPart 6141Element 6057898×2
[No Color/Any Color]
2 pieces
Sticker Sheet 1 for Set 76451-1[No Color/Any Color]Part 10112732Element 6540667×1
Sticker Sheet 2 for Set 76451-1[No Color/Any Color]Part 10113444Element 6545765×1
Bright Pink
1 piece
Plate Round 1 x 1 Swirled Top / PooBright PinkPart 53119Element 6519699×1
Medium Azure
1 piece
Plate Round 1 x 1 with Solid StudMedium AzurePart 6141Element 6102986×1
Sand Blue
1 piece
Tile 2 x 4 with GrooveSand BluePart 87079Element 6124349 or 6052832×1
Trans-Light Blue
1 piece
Tile Round 1 x 1Trans-Light BluePart 98138Element 6514192 or 6274739×1
Yellow
1 piece
Tile Round 1 x 1YellowPart 98138Element 6284577 or 6070714×1
Minifigures
6 figures
Harry PotterMinifigure, checked as a whole figure×1
Dudley Dursley, NapkinMinifigure, checked as a whole figure×1
Vernon Dursley, Tan TorsoMinifigure, checked as a whole figure×1
Petunia Dursley, White ShirtMinifigure, checked as a whole figure×1
Aunt Marge DursleyMinifigure, checked as a whole figure×1
Aunt Marge Dursley, BalloonMinifigure, checked as a whole figure×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.