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.
958 pieces in 186 part and color combinations, plus 10 minifigures.
LEGO counts 985 pieces. This inventory comes from a separate parts catalog and lists 998, including the 40 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.
Arm Mechanical with 2 Clips [Battle Droid]Light Bluish GrayPart 30377Element 6319333 or 4211658×1
Panels
1 piece
Panel 1 x 4 x 1 with Rounded Corners [Thin Wall]Light Bluish GrayPart 15207Element 6071299×1
Stickers
1 piece
Sticker Sheet for Set 4000034-1[No Color/Any Color]Part 61311Element 6274796×1
Minifigures
10 figures
Man, Light Bluish Gray Vest over White Shirt, Black Legs, Light Bluish Gray Hair, Moustache and GlassesMinifigure, checked as a whole figure×1
Man, Green V-Neck Sweater, Reddish Brown Legs, Black Hair, BeardMinifigure, checked as a whole figure×1
Medium Nougat Torso, Dark Green Legs, Dark Brown HairMinifigure, checked as a whole figure×1
Sand Blue Torso, Dark Blue Legs, Dark Brown HairMinifigure, checked as a whole figure×1
Dark Bluish Grey Torso, Sand Green Legs, Tan HairMinifigure, checked as a whole figure×1
Black Torso, Dark Tan Legs, Medium Nougat HairMinifigure, checked as a whole figure×1
Black Torso, Light Bluish Grey Legs, Black HairMinifigure, checked as a whole figure×1
Dark Bluish Grey Torso, Dark Red Legs, Reddish Brown HairMinifigure, checked as a whole figure×1
Sand Blue Torso, Olive Green Legs, Medium Nougat HairMinifigure, checked as a whole figure×1
Black Torso, Dark Brown Legs, Reddish Brown HairMinifigure, 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.