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 442 pieces. This inventory comes from a separate parts catalog and lists 438; 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.
Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top]Dark GrayPart 32530Element 4157827×8
Technic Tread HubDark GrayPart 32007Element 4214755 or 4157378×12
White
35 pieces
Large Figure Weapon, Claw Hook with AxleWhitePart 32551Element 4157102×4
Plate Round 1 x 1 with Solid StudWhitePart 6141Element 6601919 or 6141011 spare in the box×2
Technic Axle Connector Ridged [with x Hole x Orientation]WhitePart 6538bElement 4113803 or 4100407×4
Technic Axle and Pin Connector Angled #1WhitePart 32013Element 6332573 or 4118981×4
Technic Beam 1 x 11 ThickWhitePart 32525Element 6028103 or 4296265×6
Technic Beam 1 x 15 ThickWhitePart 32278Element 4542578 or 4227533×1
Technic Beam 1 x 5 ThickWhitePart 32316Element 4249021 or 4140465×2
Technic Beam 1 x 7 ThickWhitePart 32524Element 6564912 or 6318056×2
Technic Beam 2 x 4 L-Shape ThickWhitePart 32140Element 6271824 or 4118980×2
Technic Panel Fairing # 1 Large Short, Large Holes, Side AWhitePart 32190Element 4157536×1
Technic Panel Fairing # 2 Large Short, Large Holes, Side BWhitePart 32191Element 4157534×1
Technic Panel Fairing # 5 Small Short, Large Hole, Side AWhitePart 32527Element 4223032 or 4144129×1
Technic Panel Fairing # 6 Small Short, Large Hole, Side BWhitePart 32528Element 4223033 or 4144130×1
Technic Pin Double with Axle HoleWhitePart 32138Element 4130594 or 4118979×4
Yellow
9 pieces
Large Figure Mask Komau (Turaga)YellowPart 32572Element 4157538×2
Large Figure Weapon, Claw Hook with AxleYellowPart 32551Element 4154757×1
Plate Round 1 x 1 with Solid StudYellowPart 6141Element 6141241 spare in the box×2
Technic Beam 3 x 3 L-Shape with Quarter Ellipse ThinYellowPart 32249Element 4500483 or 4157537×2
Technic Beam 3 x 5 L-Shape with Quarter Ellipse ThinYellowPart 32250Element 6522621 or 6371956×2
Orange
7 pieces
Large Figure Mask Ruru (Turaga)OrangePart 32567Element 4144216×2
Large Figure Weapon, Claw Hook with AxleOrangePart 32551Element 4154616×1
Technic Beam 3 x 3 L-Shape with Quarter Ellipse ThinOrangePart 32249Element 4144139×2
Technic Beam 3 x 5 L-Shape with Quarter Ellipse ThinOrangePart 32250Element 4278162 or 4140353×2
Trans-Red
4 pieces
Plate Round 1 x 1 with Solid StudTrans-RedPart 6141Element 6514051 or 62084502 spares in the box×4
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.