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.
427 pieces in 159 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.
Weapon Pike / Spear Tip with BarTrans-RedPart 27257Element 6513950 or 64423571 spare in the box×2
Blue
2 pieces
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×2
Magenta
2 pieces
Cable, Curved Flexible with Bars on Each EndMagentaPart 6955Element 65276251 spare in the box×2
Pearl Gold
2 pieces
Tile Special Round 1 x 1 with Hollow BarPearl GoldPart 20482Element 6186672 or 61261131 spare in the box×1
Weapon Hilt with Bar, Hourglass Trans-Bright GreenPearl GoldPart 5330pat0002Element 6554482 or 6501460×1
Trans-Dark Pink
2 pieces
Tile Round 1 x 1Trans-Dark PinkPart 98138Element 6514196 or 62747451 spare in the box×2
Trans-Light Blue
1 piece
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]Trans-Light BluePart 2654Element 6581775 or 6171733×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 71492-1[No Color/Any Color]Part 10112125Element 6535433×1
Minifigures
4 figures
Cyberling, White HelmetMinifigure, checked as a whole figure×1
ZeroMinifigure, checked as a whole figure×1
Mateo, Dark Azure Torso, CapeMinifigure, checked as a whole figure×1
Logan (Dreamling Form), Cap with 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.