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's request form asks for the set number (4000031) and each piece's element ID, both listed above.
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Clear every mark for this set?
Piece checklist
Tiles Special
12 pieces
Tile Special 1 x 1 with Clip with Rounded EdgesLight Bluish GrayPart 15712Element 6308012 or 6071229×12
Plates
10 pieces
Plate 2 x 3Light Bluish GrayPart 3021Element 4211396×4
Plate 2 x 10WhitePart 3832Element 6552109 or 383201×2
Plate 2 x 3WhitePart 3021Element 6550136 or 302101×4
Animal / Creature Body Parts
8 pieces
Animal Body Part, Dinosaur, Tyrannosaurus Rex Body with Dark Orange Top, Black Stripes and Spots PrintBright Light OrangePart 98160pr0006Element 6242176×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Head with Pin, White Teeth, Black and Dark Orange Top and Black and Bright Light Orange Spots PrintBright Light OrangePart 98161pr0005Element 6242024×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Leg, Left, with Pin, Black Claws and Black Spots on Dark Orange PrintBright Light OrangePart 98162pr0006Element 6242089×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Leg, Right, with Pin, Black Claws and Black Spots on Dark Orange PrintBright Light OrangePart 98163pr0006Element 6242072×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Lower Jaw with White Teeth PrintBright Light OrangePart 98057pr0003Element 6242063×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Tail, with Pin, Black and Dark Orange Top and Black Spots PrintBright Light OrangePart 98159pr0005Element 6242195×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Arm / Leg, Left, Small, Black Claws PrintDark OrangePart 98058pr0003Element 6258455 or 6234164×1
Animal Body Part, Dinosaur, Tyrannosaurus Rex Arm / Leg, Right, Small, Black Claws PrintDark OrangePart 98059pr0003Element 6258459 or 6234173×1
Plates Special
8 pieces
Plate Special 1 x 1 Rounded with HandleWhitePart 26047Element 6564914 or 6174937×4
Plate Special 1 x 4 with 2 Studs, 3 Bottom TubesWhitePart 92593Element 4597131×4
Wedge Plate 3 x 3 Cut CornerWhitePart 2450Element 6601842 or 4280148×4
Bricks
6 pieces
Brick 2 x 4Bright Light OrangePart 3001Element 6100027 or 4645053×2
Brick 1 x 4Light Bluish GrayPart 3010Element 4211394×4
Bars, Ladders and Fences
4 pieces
Bar 4L (Lightsaber Blade / Wand)Trans-Light BluePart 30374Element 6507882 or 6170187×4
Bricks Wedged
4 pieces
Brick Wedged 3 x 3 FacetLight Bluish GrayPart 2462Element 4211718×4
Plates Round Curved and Dishes
4 pieces
Dish 2 x 2 Inverted [Radar]Trans-Light BluePart 4740Element 6580378 or 6245307×4
Tiles
4 pieces
Tile 1 x 6 with GrooveWhitePart 6636Element 6548296 or 663601×4
Flags, Banners and Signs
1 piece
Road Sign Clip-on 2 x 2 Square [Thick Open O Clip] with Curved Blue Lines and Small Black Squares PrintBlackPart 15210pr0005Element 6064043×1
Technic Bricks
1 piece
Technic Brick 6 x 8 with 4 x 6 OpeningBlackPart 32532Element 6448394 or 4188143×1
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.