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.
714 pieces in 219 part and color combinations, plus 5 minifigures.
LEGO counts 735 pieces. This inventory comes from a separate parts catalog and lists 736, including the 22 parts inside the minifigures; 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.
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.
Tile 2 x 4 with GrooveBlack ×4Dark Blue ×2Black is yellower and darker than Dark Blue.
Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / GrateBlack ×8Dark Bluish Gray ×10Black is darker than Dark Bluish Gray.
Plate 1 x 4Black ×3Dark Bluish Gray ×10Black is darker than Dark Bluish Gray.
Tile 1 x 4 with GrooveBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Tile 2 x 4 with GrooveBlack ×4Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Sticker Sheet for Set 6869-1[No Color/Any Color]Part 10839Element 6007019×1
Technic Bushes
1 piece
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedYellowPart 32123bElement 6271167 or 32123241 spare in the box×1
Tools
1 piece
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Minifigures
5 figures
Black Widow, Black Jumpsuit, Blue HighlightsMinifigure, checked as a whole figure×1
Thor with Red Cape and Bright Yellow HairMinifigure, checked as a whole figure×1
Loki, Dark Bluish Gray OutfitMinifigure, checked as a whole figure×1
Chitauri Foot SoldierMinifigure, checked as a whole figure×1
Iron Man Mark 7 Armor, No Red PanelsMinifigure, 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.