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.
1,922 pieces in 522 part and color combinations, plus 1 minifigure.
LEGO counts 1,924 pieces. This inventory comes from a separate parts catalog and lists 1,926, including the 4 parts inside the minifigures; the two do not always count the same elements, so their totals differ. 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 1 x 1White ×4Trans-Clear ×1Trans-Clear is see-through: hold the piece up to a light.
Tile 1 x 1 with GrooveWhite ×1Trans-Clear ×5Trans-Clear is see-through: hold the piece up to a light.
Bracket 1 x 2 - 2 x 2Black ×2Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Brick 1 x 1Black ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Brick 1 x 2Black ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / GrateBlack ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
27 more look-alike pairs
Brick Sloped 30° 1 x 4 x 2/3Black ×2Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Brick Special 1 x 1 with Stud on 1 SideBlack ×2Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Hinge Brick 1 x 2 BaseBlack ×2Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Hinge Plate 1 x 2 Locking with 1 Finger On TopBlack ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate 1 x 1Black ×9Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Plate 1 x 10Black ×6Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate 1 x 2Black ×16Dark Bluish Gray ×9Black is darker than Dark Bluish Gray.
Plate 1 x 6Black ×3Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Plate 2 x 10Black ×9Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 2 x 12Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 2 x 2 CornerBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 2 x 3Black ×4Dark Bluish Gray ×7Black is darker than Dark Bluish Gray.
Plate 2 x 4Black ×4Dark Bluish Gray ×12Black is darker than Dark Bluish Gray.
Plate 4 x 4Black ×3Dark Bluish Gray ×9Black is darker than Dark Bluish Gray.
Plate Round 1 x 1 with Open StudBlack ×26Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Plate Special 1 x 2 Rounded with 2 Open StudsBlack ×11Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate Special 1 x 3 Rounded with 3 Open StudsBlack ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Beam 2 x 3 Thick [90° Offset Centre Beam Hole]Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Tile 1 x 2 with GrooveBlack ×6Dark Bluish Gray ×16Black is darker than Dark Bluish Gray.
Tile 1 x 3Black ×4Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Tile 1 x 4 with GrooveBlack ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Tile 1 x 6 with GrooveBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Tile Round 1 x 1 Half CircleBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Tile Round 1 x 1 QuarterBlack ×10Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Tile Round 1 x 2 Half CircleBlack ×4Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Tile Special 2 x 2 InvertedBlack ×10Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Wedge Plate 2 x 2 Cut CornerBlack ×4Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Sticker Sheet for Set 77984-1[No Color/Any Color]Part 10117001Element 6600503×1
Minifigures
1 figure
Dennis Nedry, Yellow HoodMinifigure, 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.