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.
Animal / Creature Body Part, Neck / Tail, S Curve with PinSand GreenPart 40396Element 4291640 or 4152999×2
Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End SectionSand GreenPart 40379Element 6603878 or 4508459×1
Animal Body Part, Dinosaur, Head, SmallSand GreenPart 40384Element 4175044 or 4152982×1
Animal Body Part, Dinosaur, Legs Long, Dark Gray, Dark Green, Medium Orange PrintSand GreenPart 40382c01pr0004Element 4153001×1
Animal Body Part, Dinosaur, Legs Short, Dark Gray, Dark Green PrintSand GreenPart 40380c01pr0004Element 4154879×1
Animal Body Part, Dinosaur, Styracosaurus Head, Crested Neck and Nose Horn, with PinSand GreenPart 40389pr0001Element 4153927 or 4152988×1
Light Gray
4 pieces
Animal Body Part, Dinosaur Body Quarter with Pin Holes, Dark Gray, Sand Green, Medium Orange, and Dark Green Spotted PrintLight GrayPart 40373pr0004Element 4153895×2
Animal Body Part, Dinosaur Body Quarter with Pin Holes, Dark Gray, Sand Green, Medium Orange, and Dark Green Spotted PrintLight GrayPart 40374pr0004Element 4153899×2
Tan
4 pieces
Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End SectionTanPart 40379Element 6529788 or 6365928×4
Dark Gray
2 pieces
Brick Sloped 45° 2 x 2Dark GrayPart 3039Element 4109984×2
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.