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.
746 pieces in 148 part and color combinations, plus 2 minifigures.
The official piece count includes the 8 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.
Equipment Wand with Trans-Clear Hollow Stud PatternBlackPart 102498pat0001Element 64311851 spare in the box×1
Equipment Wand [Individual]Reddish BrownPart 36752a1 spare in the box×1
Technic Axles
2 pieces
Technic Axle 4BlackPart 3705Element 370526×1
Technic Axle 9YellowPart 60485Element 6130010×1
Tools
1 piece
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Windscreens and Fuselage
1 piece
Windscreen 6 x 4 x 1 Hexagonal with HandleOpal Trans-Light BluePart 27262Element 6513951 or 6337994×1
Minifigures
2 figures
Harry Potter, Dark Blue Jacket Dirty, Medium Legs, Printed ArmsMinifigure, checked as a whole figure×1
Remus Lupin, Dark Bluish Gray Jacket ButtonedMinifigure, 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.