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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
21 pieces in 20 part and color combinations.
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 (9788325334659) and each piece's element ID, both listed above.
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Insect, Spider with Elongated Tail Section
×1
Launcher, Weapon Gun / Blaster / Shooter Mini
×1
Mask, Batman Cowl [Plain]
×1
Weapon Batarang
×1
Launcher Trigger, Weapon Gun Trigger
×1
Weapon Gun / Pistol Two Barrel, 10 Ribs
×1
Equipment Dynamite Sticks
×1
Food Hot Dog / Sausage
×1
Tile Round 1 x 1
×2
Animal, Fish [Hollow Stud Mouth]
×1
Food Turkey Drumstick [Long] - 22mm Oval Opening
×1
Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard]
×1
Tile 1 x 2 with '100' Banknote Print
×1
Equipment Handcuffs
×1
Tool Crowbar
×1
Food Hot Dog Bun
×1
Tile Round 1 x 1 with Black Circle and Bright Green Lantern Symbol Print
×1
Plate Special Round 1 x 1 with Hollow Stud and Bar on Underside
×1
Rock 1 x 1 Crystal 5 Point
×1
Wave / Flame Rounded Large with Marbled Trans-Yellow Pattern
×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.
