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.
Technic Knob WheelBlackPart 32072Element 6284188 or 4248204×1
Technic Beams Special
2 pieces
Technic Beam 1 x 2 with Ball Joint AngledDark Bluish GrayPart 50923Element 4503381 or 4289258×2
Bricks Sloped
1 piece
Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / GrateBluePart 61409Element 4597338×1
String, Bands and Reels
1 piece
Chain 6L [5 Links]Flat SilverPart 92338Element 6323689 or 6064049×1
Tiles Round and Curved
1 piece
Tile Round 1 x 1Trans-Dark BluePart 98138Element 6514190 or 6273627×1
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.