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.
Wheel 30.4 x 20 without Pinholes, with Reinforced RimLight Bluish GrayPart 56145Element 4297210×2
Bricks Round and Cones
5 pieces
Dome Hemisphere 4 x 4 with R4-P17 Astromech Droid PrintDark RedPart 86500pr0001Element 4588132×1
Brick Round 2 x 2 with Axle HoleTrans-Light BluePart 3941Element 6514282 or 6273153×2
Brick Round Corner 3 x 3 x 2 Dome TopWhitePart 88293Element 4586275×2
Technic Beams
4 pieces
Technic Beam 1 x 3 ThinBlackPart 6632Element 6331723 or 4107828×2
Technic Beam 1 x 9 ThickBlackPart 40490Element 4645732 or 4542788×2
Transportation - Sea and Air
4 pieces
Technic Cylinder 4 x 4 with Pin Holes and Centre Bar, Closed Sides on BarWhitePart 41531Element 6297272 or 4289534×4
Tiles Special
3 pieces
Tile Special 1 x 2 Grille with Bottom GrooveBlackPart 2412bElement 241226×3
Technic Bushes
2 pieces
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedYellowPart 32123bElement 6271167 or 32123241 spare in the box×2
Minifig Accessories
1 piece
Equipment Hose Nozzle / Gun with Side String Hole SimplifiedLight Bluish GrayPart 60849Element 6641461 or 4515897×1
Stickers
1 piece
Sticker Sheet for Set 10215-1[No Color/Any Color]Part 91602Element 4587279×1
Tiles Round and Curved
1 piece
Tile Round 2 x 2 with Republic Eight-point Star PrintWhitePart 4150pr0005Element 4164206×1
Windscreens and Fuselage
1 piece
Windscreen 10 x 6 x 3 Bubble Canopy Double TaperedTrans-BrownPart 50986Element 4248365×1
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.