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.
632 pieces in 140 part and color combinations, plus 4 minifigures.
The official piece count includes the 25 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.
Brick Round 1 x 1 Open StudRed ×2Trans-Red ×4Trans-Red is see-through: hold the piece up to a light.
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 9 TeethBlack ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate 1 x 6Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Brick 1 x 2 [1 Pin Hole]Black ×4Dark Bluish Gray ×9Black is darker than Dark Bluish Gray.
Light Brick 2 x 4 [Red LED]Trans-ClearPart 54605Element 4283931×2
Pearl Light Gray
1 piece
Hose, Ribbed 7mm D. 24L / 19.2cmPearl Light GrayPart 78c24Element 4495197 or 4275390×1
Sand Blue
1 piece
Bracket 3 x 2 - 2 x 2 [aka Space Seat]Sand BluePart 4598Element 4265058×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 7713-1[No Color/Any Color]Part 56579Element 4295421×1
Minifigures
4 figures
Ha-Ya-ToMinifigure, checked as a whole figure×1
Devastator with Pearl Light Gray TorsoMinifigure, checked as a whole figure×2
Meca OneMinifigure, 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.