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.
135 pieces in 81 part and color combinations, plus 1 minifigure.
LEGO counts 138 pieces. This inventory comes from a separate parts catalog and lists 139, including the 4 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.
LEGO's request form asks for the set number (7143) and each piece's element ID, both listed above.
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Clear every mark for this set?
Piece checklist
Black
33 pieces
Brick 1 x 4BlackPart 3010Element 301026×2
Brick 2 x 3BlackPart 3002Element 300226×1
Brick Curved Inverted 6 x 1BlackPart 42023Element 6112323 or 4160409×2
Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom PinBlackPart 3747a×2
Hinge Brick 1 x 2 Locking with 1 Finger Vertical End and 2 Fingers Vertical End, 9 TeethBlackPart 30386Element 4167106 or 3038626×2
Hinge Brick 2 x 2 Locking with 2 Fingers Vertical and Axle Hole, 9 TeethBlackPart 40902Element 4162235×1
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 9 TeethBlackPart 30553Element 4143372×3
Hinge Vehicle Roof 4 x 4BlackPart 4213Element 421326×2
Plate 1 x 4BlackPart 3710Element 371026×5
Plate 1 x 6BlackPart 3666Element 366626×5
Plate 2 x 4BlackPart 3020Element 302026×1
Plate Special 1 x 2 Side Handle [Free Ends]BlackPart 2540Element 4140588 or 254026×2
Technic Axle 3BlackPart 4519Element 6238084 or 451926×1
Tile 1 x 2 with Avionics Copper, Red & Silver Controls PrintBlackPart 3069bpr0070Element 6021512 or 4162982×1
Tile Special 1 x 2 Grille with Bottom GrooveBlackPart 2412bElement 241226×2
Wedge Plate 3 x 4 without Stud NotchesBlackPart 4859×1
White
31 pieces
Brick 1 x 2WhitePart 3004Element 6548257 or 4613964×6
Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder with Silver and Red Astromech Droid Print (R5-D4)WhitePart 30367bpr0007Element 4124159×1
Brick Sloped 33° 3 x 1WhitePart 4286Element 6632142 or 428601×2
Brick Sloped 45° 2 x 1 Double / Inverted with Hollow BottomWhitePart 3049cElement 4167100 or 304901×1
Brick Sloped 45° 2 x 4 with Red and Gold Triangles Left PrintWhitePart 3037pr0017×1
Brick Sloped 45° 2 x 4 with Red and Gold Triangles Right PrintWhitePart 3037pr0016×1
Brick Wedged, Curved 12 x 3 Left with Gray Panels & Lime, Orange, and Dark Red Markings PrintWhitePart 42061pr0004×1
Brick Wedged, Curved 12 x 3 Right with Gray Panels & Lime, Orange, and Dark Red Markings PrintWhitePart 42060pr0004×1
Brick Wedged, Curved 6 x 2 Left, Inner RidgesWhitePart 41748Element 6552117 or 4160124×1
Flag 2 x 2 Square [Thin Clips]RedPart 2335Element 4523404 or 4162384×2
Plate 2 x 12RedPart 2445Element 4255035 or 4161545×2
Tile 1 x 4 with GrooveRedPart 2431Element 243121×2
Lime
6 pieces
Brick Special 2 x 2 with Pin and Axle HoleLimePart 6232Element 4164038×2
Brick Wedged, Angled 4 x 2 LeftLimePart 41768Element 6208286 or 4166241×1
Brick Wedged, Angled 4 x 2 RightLimePart 41767Element 6208290 or 4166240×1
Technic Brick 1 x 2 [2 Pin Holes]LimePart 32000Element 4164110×2
Blue
5 pieces
Brick 2 x 8BluePart 3007Element 6037384 or 300723×1
Hinge Vehicle Roof Holder 1 x 4BluePart 4315Element 4256388 or 4167102×2
Plate 2 x 4BluePart 3020Element 4240375 or 302023×2
Yellow
2 pieces
Brick 2 x 2YellowPart 3003Element 4103588 or 300374×1
Brick Curved 2 x 2 x 2/3 Two Studs and Lip EndYellowPart 41855Element 4163718×1
Chrome Silver
1 piece
Weapon Lightsaber Hilt without Bottom RingChrome SilverPart 23306Element 41240501 spare in the box×1
Trans-Brown
1 piece
Windscreen 6 x 4 x 2 Wedge CurvedTrans-BrownPart 41883Element 4286384 or 4163015×1
Trans-Light Blue
1 piece
Bar 4L (Lightsaber Blade / Wand)Trans-Light BluePart 30374Element 6507882 or 6170187×1
Minifigures
1 figure
Obi-Wan Kenobi, Yellow Skin, HeadsetMinifigure, 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.