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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
46 pieces in 23 part and color combinations, plus 1 minifigure.
LEGO counts 53 pieces. This inventory comes from a separate parts catalog and lists 50, including the 4 parts inside the minifigures; the two do not always count the same elements, so their totals differ. 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.
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.
Brick 1 x 4
White ×2
Trans-Clear ×2
Trans-Clear is see-through: hold the piece up to a light.
Brick Sloped 45° 2 x 1 without Bottom Pin
White ×2
Trans-Clear ×2
Trans-Clear is see-through: hold the piece up to a light.
LEGO's request form asks for the set number (709) and each piece's element ID, both listed above.
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Plate 1 x 1
×2
Plate 1 x 1
×2
Plate 1 x 2
×6
Plate 2 x 3
×4
Plate 2 x 4
×1
Plate 4 x 6
×1
Brick Sloped 45° 2 x 1 without Bottom Pin
Also in White
×2
Brick Sloped 45° 2 x 3
×4
Brick Sloped 33° 3 x 2
×3
Brick Sloped 45° 2 x 1 without Bottom Pin
Also in Trans-Clear
×2
Brick 1 x 4
Also in White
×2
Brick 1 x 2
×3
Brick 1 x 4
Also in Trans-Clear
×2
Brick 1 x 8
×2
Boat Hull Section, Bow 6 x 8 x 3 1/3 with Light Gray Deck
×1
Boat Hull Section, Middle 6 x 8 x 3 1/3 with Light Gray Deck
×1
Boat Hull Section, Stern 6 x 6 x 3 1/3 with Light Gray Deck
×1
Boat, Keel Weighted 8 x 2 x 4
×1
Brick Round Corner 2 x 2 Macaroni with Stud Notch
×2
Technic Axle 4
×1
Technic Bush
×1
Black Torso, Black Legs, White Hat
×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.
