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.
Trunk / Chest Bottom 4 x 6 x 2 1/3Trans-Dark PinkPart 4237Element 4499913 or 4140605×1
Trunk / Chest Lid 4 x 6 x 1 2/3Trans-Dark PinkPart 4238Element 4499914 or 4140606×1
Panels
3 pieces
Belville Wall 6 x 8 x 12 - Tower with WindowWhitePart 33213Element 4284987 or 4161467×3
Tiles
3 pieces
Tile 1 x 4 with GrooveWhitePart 2431Element 6548255 or 243101×2
Tile 1 x 8 with GrooveWhitePart 4162Element 6552110 or 416201×1
Windows and Doors
3 pieces
Door 1 x 4 x 6Bright PinkPart 3644Element 4499912×2
Door Frame Arched 1 x 8 x 12WhitePart 33227Element 4250220 or 4163653×1
Bars, Ladders and Fences
2 pieces
Fence 2 x 12 x 6WhitePart 30110Element 4499911 or 4189028×2
Bricks Sloped
2 pieces
Roof / Tower 6 x 8 x 9MagentaPart 33215Element 4288054 or 4184894×2
Bricks Special
2 pieces
Brick Special 1 x 1 with HandleWhitePart 2921Element 6615537 or 6170567×2
Plates Round Curved and Dishes
2 pieces
Dish 2 x 2 Inverted [Radar]Trans-Dark PinkPart 4740Element 6580376 or 6245302×2
Plates
1 piece
Plate 4 x 6WhitePart 3032Element 303201×1
Stickers
1 piece
Sticker Sheet for Sets 7577-1, 7581-1[No Color/Any Color]Part 54771Element 4284952×1
String, Bands and Reels
1 piece
String with End Studs 11L OverallBlackPart 14226c11Element 6096955 or 6037558×1
Minifigures
2 figures
Belville Princess, Light Blue DressMinifigure, checked as a whole figure×1
Belville Princess, Dark Pink DressMinifigure, 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.