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.
340 pieces in 109 part and color combinations, plus 4 minifigures.
The official piece count includes the 22 parts inside the set's minifigures, which this inventory lists separately. 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.
Look-alike colors in this set
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color,
check whether it went in where the other color belongs. Each color has its own element ID in the parts list
at the back of the instructions.
Technic Brick Special 2 x 2 with Ball Socket Wide and Axle HoleBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate Round 1 x 1 with Solid StudFlat SilverPart 6141Element 46336911 spare in the box×8
Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot]Flat SilverPart 99563Element 6208446×3
Blue
4 pieces
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×4
Pearl Gold
2 pieces
Weapon Bladed Claw SpreadPearl GoldPart 10187Element 62419361 spare in the box×2
Dark Brown
1 piece
Hair Short, Tousled with Side PartDark BrownPart 62810Element 4535553×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 76124-1[No Color/Any Color]Part 49539Element 6261720×1
Minifigures
4 figures
OutriderMinifigure, checked as a whole figure×1
Outrider with Shoulder ArmorMinifigure, checked as a whole figure×1
Ant-Man (Scott Lang), White Advanced Tech (Quantum) SuitMinifigure, checked as a whole figure×1
War Machine, White Advanced Tech (Quantum) SuitMinifigure, 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.