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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
23 pieces in 16 part and color combinations, plus 1 minifigure.
The official piece count includes the 5 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 (6821) and each piece's element ID, both listed above.
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Antenna 1 x 4 with Rounded Top
×1
Arm Holder Brick 2 x 2 with Hole and 1 Arm
×1
Arm Piece Straight with 2 and 3 Fingers
×2
Arm Piece with Towball Socket, 3 Fingers
×1
Brick 1 x 2
×1
Brick Sloped 45° 2 x 2 with Computer Panel Print
×1
Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin
×1
Brick Special 1 x 1 with 3 Speakers / Loudspeakers / Space Positioning Rockets
×2
Construction Vehicle Bucket, Slope Inverted 33° 3 x 2 Hollow with Towball (Arm Piece)
×1
Plate 2 x 6
×1
Plate Special 1 x 1 with Clip Vertical [Thin Open O Clip]
1 spare in the box
×1
Plate Special 2 x 2 with Wheels Red
×2
Steering Stand 1 x 2 with Black Steering Wheel
×1
Equipment Radio [Compact Handle]
×1
Tyre 15 x 6 Offset Tread Small
×4
Plate 1 x 1
1 spare in the box
×2
Classic Spaceman, White with Airtanks (3842a Helmet)
×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.
