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.
583 pieces in 218 part and color combinations, plus 3 minifigures.
The piece count includes the 16 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.
Before you call it missing
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Look-alike colors in this set
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color,
check whether it went in where the other color belongs. Each color has its own element ID in the parts list
at the back of the instructions.
Plate Round 1 x 1 with Solid StudRed ×2Trans-Red ×14Trans-Red is see-through: hold the piece up to a light.
Tile Special 1 x 2 Grille with Bottom GrooveRed ×1Trans-Red ×2Trans-Red is see-through: hold the piece up to a light.
Bracket 1 x 2 - 2 x 2Black ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Brick 1 x 4Black ×3Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Cone 1 x 1 [No Top Groove]Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 1 x 2Black ×8Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
4 more look-alike pairs
Plate 1 x 6Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 2 x 3Black ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Wedge Plate 4 x 2 LeftBlack ×4Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Wedge Plate 4 x 2 RightBlack ×4Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×2
Trans-Neon Green
1 piece
Rock 1 x 1 Jewel / Gem 24 FacetTrans-Neon GreenPart 30153Element 6247790 or 4114505×1
[No Color/Any Color]
1 piece
Sticker Sheet for Sets 7774-1, 7775-1[No Color/Any Color]Part 58840Element 4501861×1
Minifigures
3 figures
Skeleton, Evil Face, Ball Joint ArmsMinifigure, checked as a whole figure×1
Aquaraider Diver 8Minifigure, checked as a whole figure×1
Aquaraider Diver 5 with Dark Bluish Gray HatMinifigure, 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.