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.
577 pieces in 275 part and color combinations, plus 4 minifigures.
The official 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.
Brick Round 2 x 2 with Axle HoleDark Turquoise ×1Medium Azure ×1Dark Turquoise is darker than Medium Azure.
Plate 2 x 2Dark Turquoise ×3Medium Azure ×1Dark Turquoise is darker than Medium Azure.
Tile 1 x 4 with GrooveDark Turquoise ×4Medium Azure ×2Dark Turquoise is darker than Medium Azure.
Pneumatic T-Piece (T Bar) [New Style]WhitePart 4697bElement 6615553 or 62898661 spare in the box×1
Stickers
1 piece
Sticker Sheet for Set 41718-1[No Color/Any Color]Part 84122Element 6373976×1
Tools
1 piece
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Minifigures
4 figures
Priyanka - Coral Top, White Shorts, Black HairMinifigure, checked as a whole figure×1
Henry - Microdoll - Dark Turquoise Shirt, Light Bluish Grey PantsMinifigure, checked as a whole figure×1
River - Red Jacket, Black Pants, Dark Brown HairMinifigure, checked as a whole figure×1
Emma - Coral Top, Medium Lavender Skirt, Dark Purple Cat EarsMinifigure, 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.