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.
Cone 1 x 1 [No Top Groove]Trans-RedPart 4589Element 618841×6
Blue
4 pieces
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×4
Reddish Brown
4 pieces
Plate 2 x 2Reddish BrownPart 3022Element 4613975 or 4216695×4
Trans-Clear
4 pieces
Hinge Plate 1 x 8 Locking with Angled Side Extensions, Rounded Plate Underside, 9 TeethTrans-ClearPart 30407Element 4522776 or 4182186×4
Lime
2 pieces
Technic Ball JointLimePart 32474Element 4624381 or 4290718×2
Trans-Brown
1 piece
Panel 3 x 2 x 6Trans-BrownPart 2466Element 4501020×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 8117-1[No Color/Any Color]Part 62018bElement 4520943×1
Minifigures
1 figure
Iron Drone / Devastator with Red EyesMinifigure, 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.