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.
1,178 pieces in 283 part and color combinations, plus 6 minifigures.
The official piece count includes the 26 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 Pin Connector Round [Slotted]Light Bluish Gray ×6Flat Silver ×1Light Bluish Gray is lighter than Flat Silver.
Arm Mechanical with 2 Clips [Battle Droid]Black ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Brick Sloped 45° 2 x 1 Triple with Inside Stud HolderBlack ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Brick Sloped Inverted 34° 3 x 1 with Internal StopperBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 1 x 8Black ×1Dark Bluish Gray ×8Black is darker than Dark Bluish Gray.
Plate 4 x 4Black ×6Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
3 more look-alike pairs
Tile 1 x 4 with GrooveBlack ×4Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Wedge Plate 4 x 2 LeftBlack ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Wedge Plate 4 x 2 RightBlack ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleRedPart 32184Element 6276963 or 4128598×1
Technic Brick 1 x 1 with Pin HoleRedPart 6541Element 654121×2
Dark Tan
5 pieces
Technic Axle 3 with StudDark TanPart 6587Element 6031821 or 6013821×1
Technic Axle 5 with StopDark TanPart 15462Element 6055631×4
Trans-Dark Blue
4 pieces
Cone 1 x 1 [Top Groove]Trans-Dark BluePart 59900Element 6514018 or 6301313×4
Trans-Green
2 pieces
Tile Round 1 x 1Trans-GreenPart 98138Element 6514194 or 62747421 spare in the box×2
Orange
1 piece
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Trans-Red
1 piece
Tile Round 1 x 1Trans-RedPart 98138Element 6514189 or 62586071 spare in the box×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 70173-1[No Color/Any Color]Part 21705Element 6117892×1
Minifigures
6 figures
Agent Trey SwiftMinifigure, checked as a whole figure×1
Terabyte with Dark Orange HairMinifigure, checked as a whole figure×1
Electrolyzer with Neck BracketMinifigure, checked as a whole figure×1
Agent Steve ZealMinifigure, checked as a whole figure×1
Agent Jack Fury with Helmet and Shoulder ArmorMinifigure, checked as a whole figure×1
Agent Caila Phoenix with HelmetMinifigure, 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.