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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.
Checking
31 pieces in 14 part and color combinations, plus 1 minifigure.
The official piece count includes the 3 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
LEGO's request form asks for the set number (682501) and each piece's element ID, both listed above.
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Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Medium
×3
Arm Mechanical with Clip [Thick Support]
×3
Bracket 1 x 2 - 1 x 2 Inverted
×3
Hinge Brick 1 x 2 Base
×2
Hinge Brick 1 x 2 Top Plate Thin
×2
Minifig Head Venom, White Eyes, White Teeth, Red Tongue Print [Hollow Stud]
×3
Plant / Animal Body Part, Tree / Branch / Tail / Appendage / Tentacle with Pin
×2
Plate Round 1 x 1 with Open Stud
×4
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)
×3
Plate Special 2 x 2 with Bar Frame Octagonal, Reinforced, Completely Round Studs
×1
Plate Special Round 1 x 1 with Hollow Stud and Bar on Underside - Long Space
×2
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)
×1
Brick Round 2 x 2 with Axle Hole
×1
Plate Special 1 x 2 with Three Teeth [Tri-Tooth]
×1
Venom with Open Mouth
×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.
