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.
291 pieces in 137 part and color combinations, plus 2 minifigures.
LEGO counts 293 pieces. This inventory comes from a separate parts catalog and lists 300, including the 9 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.
Cone 1 x 1 [No Top Groove]Yellow ×2Trans-Yellow ×2Trans-Yellow is see-through: hold the piece up to a light.
Creature Body Part, Dragon Wing 8 x 10 [Plain]BlackPart 55706Element 6433446 or 6270056×1
Stickers
1 piece
Sticker Sheet for Set 7786-1[No Color/Any Color]Part 60400Element 4511970×1
Technic Special
1 piece
Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint SocketDark Bluish GrayPart 48169Element 6278974 or 4225973×1
Windscreens and Fuselage
1 piece
Windscreen 7 x 4 x 1 2/3 with HingesTrans-BrownPart 30372Element 4193545 or 4124122×1
Minifigures
2 figures
Batman, Light Bluish Gray Suit, Dark Blue Cape and CowlMinifigure, checked as a whole figure×1
Scarecrow with Glow in the Dark Head and Black 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.