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.
LEGO counts 962 pieces. This inventory comes from a separate parts catalog and lists 964; 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.
Sail, Triangular, Black with '37th America's Cup Barcelona', 'Emirates FLY BETTER', 'OMEGA', 'TOYOTA', New Zealand Flag and Red and Dark Turquoise Waves Left Print[No Color/Any Color]Part 1037622a×1
Sail, Triangular, Black with '37th America's Cup Barcelona', 'Emirates FLY BETTER', 'OMEGA', 'TOYOTA', New Zealand Flag and Red and Dark Turquoise Waves Right Print[No Color/Any Color]Part 1037622b×1
Sail, Triangular, Black with 'OMEGA', 37th America's Cup Barcelona Logo and Red and Dark Turquoise Waves Print[No Color/Any Color]Part 1036965a×1
Sticker Sheet for Set 42174-1[No Color/Any Color]Part 10105330Element 6462843×1
Reddish Brown
2 pieces
Technic Axle 5 with StopReddish BrownPart 15462Element 6159763×2
Technic Axle 3 with StudDark TanPart 6587Element 6031821 or 6013821×1
Reddish Orange
1 piece
Pneumatic T-Piece (T Bar) [New Style]Reddish OrangePart 4697bElement 64860911 spare in the box×1
Trans-Clear
1 piece
Tile Special Round 1 x 1 with Hollow BarTrans-ClearPart 20482Element 6507895 or 61868671 spare in the box×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.