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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.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
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.
Technic Axle Connector 2 x 3 with Ball Socket, Open Sides
Black ×2
Dark Bluish Gray ×1
Black is darker than Dark Bluish Gray.
LEGO's request form asks for the set number (7716) and each piece's element ID, both listed above.
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Large Figure Skeletal, Limb, with 2 Ball Joints, and Hole (Toa Metru)
×2
Rip Cord, Rhotuka, 12L with Connector Block 1 x 3 x 5
×1
Technic Axle Connector 2 x 3 with Ball Socket, Open Sides
Also in Dark Bluish Gray
×2
Technic Beam 1 x 9 Thick
×1
Technic Connector Block 3 x 3 Triangular with Axle, and Pin Hole
×2
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]
×1
Large Figure Skeletal, Connector Block 1 x 3 x 2 with 2 Pins and Axle Hole (Rhotuka)
×1
Large Figure Skeletal, Limb, Angular 90°, 3 x 3 x 2 with 2 Ball Joints, and Axle Hole
×2
Technic Axle Connector 2 x 3 with Ball Socket, Open Sides
Also in Black
×1
Technic Axle and Pin Connector 2 x 5 with Two Ball Joint Sockets
×2
Technic Pin without Friction Ridges Lengthwise
×2
Technic Axle Pin with Friction Ridges Lengthwise
×1
Large Figure Spinner / Propeller without Code (Rhotuka) [Plain]
×1
Large Figure Mask Matatu (Toa Metru)
×1
Large Figure Spinner Rod 2.5L with Gear 8 Tooth (Rhotuka)
×1
Tick each piece as you find it, or mark it missing.
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.
Request a replacement from LEGOMark 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.
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.
