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.
572 pieces in 150 part and color combinations, plus 5 minifigures.
LEGO counts 591 pieces. This inventory comes from a separate parts catalog and lists 597, including the 25 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.
Equipment Goblet / GlassTrans-ClearPart 2343Element 6166107 or 3000240×1
Trans-Neon Green
1 piece
Insect, SpiderTrans-Neon GreenPart 30238Element 6109894 or 4120133×1
Yellow
1 piece
Tile 1 x 2 with GrooveYellowPart 3069bElement 306924×1
Minifigures
5 figures
Ron Weasley, Yellow Skin, Gryffindor Sweater with Crest, Cape with StarsMinifigure, checked as a whole figure×1
Harry Potter, Yellow Skin, Gryffindor Sweater with Crest, Cape with StarsMinifigure, checked as a whole figure×1
Professor Gilderoy Lockhart, Sand Red OutfitMinifigure, checked as a whole figure×1
Ginny Weasley, Yellow Skin, Gryffindor Sweater with Crest, Cape with StarsMinifigure, checked as a whole figure×1
Tom Riddle, Yellow Skin, Slytherin Sweater with Crest, CapeMinifigure, 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.