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.
Large Figure Accessory, Chain Link SectionPearl Light GrayPart 53551Element 4494087 or 4292495×9
Large Figure Barraki Spine FlexiblePearl Light GrayPart 57562Element 4506045×2
Large Figure Chest Cover (Toa Metru)Pearl Light GrayPart 49423Element 4294799 or 4247224×1
Large Figure Head, Barraki, SpinaxPearl Light GrayPart 57571Element 4497146×1
Large Figure Limb Cover / Back Plate (Hydruka)Pearl Light GrayPart 59577Element 4505846×1
Large Figure Limb Cover, Upper Leg Section (Piraka)Pearl Light GrayPart 53566Element 4507719×6
Large Figure Torso Cover, Armour, Toa HordikaPearl Light GrayPart 50926Element 4278809 or 4255123×1
Large Figure Weapon Blade, Aqua Warblade (Hewkii Mahri)Pearl Light GrayPart 57527Element 4504534×2
Large Figure Weapon Claw Blade, SmallPearl Light GrayPart 57528Element 4504538×1
Large Figure Weapon Staff, Vahki Staff of Loyalty (Bordakh)Pearl Light GrayPart 47337Element 4294360 or 4227883×1
Large Figure Weapon, Claw, Triple, with AxlePearl Light GrayPart 32506Element 4284479 or 4236020×1
Launcher, Large Figure Weapon Cannon, Cordak BlasterPearl Light GrayPart 57523c01Element 4544505 or 4504505×1
Technic Axle and Pin Connector, Perpendicular with ExtensionPearl Light GrayPart 53586Element 4494486 or 4286268×4
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Pearl Light GrayPart 41669Element 4284480 or 4177440×8
Blue
9 pieces
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×9
Pearl Dark Gray
7 pieces
Large Figure Foot, Barraki KalmahPearl Dark GrayPart 58230Element 4506736×1
Large Figure Foot, Toa MetruPearl Dark GrayPart 47298Element 4506758×2
Large Figure Mask Ignika (Vezon)Pearl Dark GrayPart 53584Element 4506734×2
Large Figure Weapon 5 x 5 Shield with Wrench ToothedPearl Dark GrayPart 44936Element 4506737×2
Trans-Red
5 pieces
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki EyeTrans-RedPart 58176Element 6507867 or 6171762×2
Technic Axle Connector Ridged [with x Hole x Orientation]Trans-RedPart 6538bElement 4163625×3
Trans-Dark Blue
2 pieces
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki EyeTrans-Dark BluePart 58176Element 6328198 or 6171763×2
Trans-Neon Orange
1 piece
Large Figure Head Connector Block Eye/Brain Stalk (Toa Metru)Trans-Neon OrangePart 47313Element 4238919 or 4218713×1
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.