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.
640 pieces in 144 part and color combinations, plus 3 minifigures.
LEGO counts 645 pieces. This inventory comes from a separate parts catalog and lists 652, including the 12 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.
Brick Round 1 x 1 Open StudRed ×2Trans-Red ×2Trans-Red is see-through: hold the piece up to a light.
Cone 1 x 1 [No Top Groove]Yellow ×2Trans-Yellow ×2Trans-Yellow is see-through: hold the piece up to a light.
Plate Round 1 x 1 with Solid StudBlack ×2Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Plate Special 1 x 2 with 1 Stud without Groove (Jumper)Black ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Tile Special 1 x 2 Grille with Bottom GrooveBlack ×6Dark Bluish Gray ×7Black is darker than Dark Bluish Gray.
Windscreen 10 x 6 x 2 CurvedTrans-BrownPart 45705Element 6507923 or 6262645×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 7787-1[No Color/Any Color]Part 60401Element 4511973×1
Minifigures
3 figures
The Riddler with Black HairMinifigure, checked as a whole figure×1
Bane, Black Head, Black HandsMinifigure, checked as a whole figure×1
Batman, Light Bluish Gray Suit, Dark Blue Cape and CowlMinifigure, 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.