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.
472 pieces in 178 part and color combinations, plus 4 minifigures.
The official piece count includes the 17 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 Special 1 x 2 Rounded with 2 Open StudsBlack ×8Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Pin 1/2 with FrictionRedPart 89678Element 63781201 spare in the box×1
Bright Light Orange
3 pieces
Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot]Bright Light OrangePart 99563Element 6236454×3
Trans-Orange
3 pieces
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki EyeTrans-OrangePart 58176Element 6507868 or 61717641 spare in the box×3
Yellowish Green
2 pieces
Animal, Fish [Hollow Stud Mouth]Yellowish GreenPart 64648Element 6291414×2
Dark Azure
1 piece
Plate 8 x 8 with Rounded EndDark AzurePart 41948Element 6304883×1
Medium Nougat
1 piece
Box / Crate with Handholds 3 x 4 x 1 2/3Medium NougatPart 30150Element 6035734×1
Trans-Bright Green
1 piece
Rock 1 x 1 Crystal 5 PointTrans-Bright GreenPart 30385Element 6507862 or 6170292×1
Trans-Green
1 piece
Tile Round 1 x 1Trans-GreenPart 98138Element 6514194 or 62747421 spare in the box×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 60378-1[No Color/Any Color]Part 10103049Element 6434406×1
Minifigures
4 figures
Arctic Explorer, Medium Azure Suit, Medium Nougat HairMinifigure, checked as a whole figure×1
Arctic Explorer, STEVEGOESNORTH, Orange Suit, Dark Blue Ushanka HatMinifigure, checked as a whole figure×1
Arctic Explorer, Tina Tarantula, Orange Suit, Dark Blue Beanie Hat with HairMinifigure, checked as a whole figure×1
Arctic Explorer, Captain Nautilus, Medium Azure Jacket, Orange Legs, White Fur CollarMinifigure, 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.