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.
741 pieces in 189 part and color combinations, plus 3 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.
Look-alike colors in this set
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color,
check whether it went in where the other color belongs. Each color has its own element ID in the parts list
at the back of the instructions.
Plate Round 1 x 1 with Solid StudOrange ×10Trans-Neon Orange ×4Trans-Neon Orange is see-through: hold the piece up to a light.
Technic Brick 1 x 2 [2 Pin Holes]Black ×2Dark Bluish Gray ×8Black is darker than Dark Bluish Gray.
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening]YellowPart 32064b×8
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedYellowPart 32123bElement 6271167 or 32123241 spare in the box×2
Trans-Neon Orange
4 pieces
Plate Round 1 x 1 with Solid StudTrans-Neon OrangePart 6141Element 6240218 or 30057471 spare in the boxAlso in Orange×4
Tan
2 pieces
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×2
Trans-Orange
2 pieces
Windscreen 6 x 4 x 2 Wedge CurvedTrans-OrangePart 41883Element 4505858×1
Windscreen 8 x 6 x 4 with Locking Dual 2 FingersTrans-OrangePart 62694Element 4534860×1
[No Color/Any Color]
2 pieces
Sticker Sheet 1 for Set 7649-1[No Color/Any Color]Part 64399Element 4534999×1
Sticker Sheet 2 for Set 7649-1[No Color/Any Color]Part 64400Element 4535001×1
Minifigures
3 figures
Martian, Alien CommanderMinifigure, checked as a whole figure×1
Mars Astronaut, Balaclava, and BackpackMinifigure, checked as a whole figure×1
Mars Astronaut, Cheek Lines, and BackpackMinifigure, 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.