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.
452 pieces in 148 part and color combinations, plus 4 minifigures.
LEGO counts 476 pieces. This inventory comes from a separate parts catalog and lists 479, including the 27 parts inside the minifigures; the two do not always count the same elements, so their totals differ. 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.
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, SmallWhitePart 53451Element 6270106 or 45683871 spare in the box×1
Brick Sloped 45° 2 x 2 with Green Radar, Green/Red Buttons and Disk Slot PrintWhitePart 3039pr0002Element 4195659×1
Brick Wedged, Sloped Inverted 4 x 4 Triple [2 Connections between Front Studs]WhitePart 4855Element 485501×2
Tan
3 pieces
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×3
Glow In Dark Trans
2 pieces
Plant / Creature Body Part, Vine / Tail / Tentacle / Bionicle Spine, SpikyGlow In Dark TransPart 55236Element 4578512 or 4500078×2
Pearl Dark Gray
2 pieces
Arm Mechanical with Clip [Thin Support]Pearl Dark GrayPart 53989Element 4294997×2
Pearl Gold
2 pieces
Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope EndPearl GoldPart 47457Element 4286597×1
Weapon TridentPearl GoldPart 92290Element 6270116 or 4595077×1
[No Color/Any Color]
2 pieces
Play Gear, 3D Glasses Atlantis[No Color/Any Color]Part 852906×1
Sticker Sheet for Set 8075 -1[No Color/Any Color]Part 89145Element 4570550×1
Trans-Green
1 piece
Tile 1 x 1 with GrooveTrans-GreenPart 3070bElement 6581818 or 62542491 spare in the box×1
Trans-Red
1 piece
Tile 1 x 1 with GrooveTrans-RedPart 3070bElement 6581817 or 62542481 spare in the box×1
Minifigures
4 figures
Atlantis Manta WarriorMinifigure, checked as a whole figure×1
Jeff FisherMinifigure, checked as a whole figure×1
Ace SpeedmanMinifigure, checked as a whole figure×1
Axel with Backpack with Wide LightsMinifigure, 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.