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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.
LEGO's request form asks for the set number (5382) and each piece's element ID, both listed above.
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Minifig Footwear Flipper [Thin]
×2
Equipment Grab Jaw Holder
×1
Minifig Footwear Flipper [Thin]
×2
Equipment Suction Cup Gun
×1
Tile 2 x 2 with Aquazone Silver and Copper Circular Print
×1
Tile 1 x 2 with Copper and White Circuitry, Red Rectangle and 4 Squares Print
×1
Tile 1 x 2 with Blue Windows and Bubbles Print
×1
Brick Sloped 45° 2 x 2 with Red Square and Circuitry Print
×1
Brick Sloped 45° 2 x 2 with Dark Screen and Blue Controls Print (Aquazone Hydronauts)
×1
Arm Grab Jaw
×2
Helmet - Space with 2 Rear Studs
×1
Helmet Underwater, Breathing Apparatus
×1
Weapon Harpoon [4 Grooves on Shaft]
×2
Headwear Accessory Visor / Divers Mask (Underwater)
×1
Rock 1 x 1 Crystal 5 Point
×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.
