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 Body Part, Barb / Claw / Tooth / Talon / Horn, SmallYellowPart 53451Element 6270110 or 6014033×4
Minifig Upper Body
4 pieces
Arm Mechanical with Clip [Thick Support]BluePart 98313Element 6014032×4
Bars, Ladders and Fences
2 pieces
Bar 4L (Lightsaber Blade / Wand)Trans-Neon GreenPart 30374Element 6507881 or 6170186×2
Bricks Round and Cones
2 pieces
Cone 1 x 1 [Top Groove]Trans-Neon GreenPart 59900Element 6301321 or 6172230×2
Energy Effects
2 pieces
Large Figure Weapon Accessory, Flame / Lightning Bolt with Axle Hole with Marbled Trans-Yellow PatternTrans-Dark BluePart 11302pat0001Element 6029331×2
Technic Bushes
2 pieces
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718171 spare in the box×2
Technic Beams
1 piece
Technic Beam 3 x 3 T-Shape ThickDark Bluish GrayPart 60484Element 4552349 or 4535773×1
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.