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.
Tile 2 x 2 with GrooveBright Light OrangePart 3068bElement 6020147 or 4525871×1
Tile 2 x 3Bright Light OrangePart 26603Element 6286881×1
Tile 2 x 2 with GrooveBright PinkPart 3068bElement 4615728×1
Tile 2 x 3Bright PinkPart 26603Element 6290982×1
Tile 2 x 3LavenderPart 26603Element 6325969×1
Tile 2 x 2 with GrooveMagentaPart 3068bElement 6249234 or 4173214×1
Tile 2 x 3MagentaPart 26603Element 6468041 or 6292373×1
Energy Effects
4 pieces
Wave / Flame Small with PinTrans-OrangePart 37775Element 6514274 or 63577471 spare in the box×4
Bars, Ladders and Fences
2 pieces
Bar, Angled with 1 x 1 Round Plate / Stud on EndTrans-ClearPart 65578Element 6510188 or 62855871 spare in the box×2
Plates Wedged
2 pieces
Wedge Plate 2 x 2 Cut CornerMagentaPart 26601Element 6249742×2
Minifig Heads
1 piece
Minifig Head Skeleton, Standard Skull PrintWhitePart 3626cpr0895Element 4651445×1
Stickers
1 piece
Sticker Sheet for Set 40811-1[No Color/Any Color]Part 10114463Element 6563183×1
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.