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.
571 pieces in 152 part and color combinations, plus 4 minifigures.
The official piece count includes the 18 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.
Windscreen 4 x 4 x 4 2/3 with HandleTrans-BrownPart 11289Element 6514340 or 6280337×1
Trans-Yellow
1 piece
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]Trans-YellowPart 2654Element 6581773 or 6171728×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 70164-1[No Color/Any Color]Part 17637Element 6074618×1
Minifigures
4 figures
Agent Caila PhoenixMinifigure, checked as a whole figure×1
Astor City GuardMinifigure, checked as a whole figure×1
Agent Jack Fury with Neck BracketMinifigure, checked as a whole figure×1
Psyclone with Neck BracketMinifigure, 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.