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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.
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)
Black ×1
Dark Bluish Gray ×3
Black is darker than Dark Bluish Gray.
LEGO's request form asks for the set number (6523834) and each piece's element ID, both listed above.
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Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)
Also in Dark Bluish Gray
×1
Plate Round 1 x 1 with Solid Stud
×12
Plate Round 4 x 4 with Pin Hole
×1
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)
Also in Black
×3
Plate Round 4 x 4 with Pin Hole
×1
Dish 6 x 6 Inverted (Radar) with Solid Studs
×1
Plate Round 1 x 1 with Open Stud
×4
Plate Round 6 x 6 with Hole
×1
Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style]
×4
Brick Round Corner 3 x 3 x 1 No Studs
×4
Brick Round 2 x 2 x 1 2/3 Dome Top, Hollow Stud
×1
Brick Round 2 x 2 with Axle Hole
×1
Wave / Lightning Angular, Single
×4
Plate Special Round 1 x 2 Half Circle with Stud (Jumper)
×4
Technic Axle 4
×1
Technic Axle 2 Notched
×2
Technic Axle Connector Smooth [with x Hole + Orientation]
×2
Minifig Head [Plain] [Vented Stud - 2 Holes]
×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.
