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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
25 pieces in 18 part and color combinations.
LEGO counts 24 pieces. This inventory comes from a separate parts catalog and lists 25; 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.
LEGO's request form asks for the set number (891504) and each piece's element ID, both listed above.
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Bar 1L with Top Stud and Two Side Studs
×1
Brick Sloped 45° 2 x 1 Triple with Inside Stud Holder
×1
Hat, Conical Asian Style
×1
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)
×1
Weapon Dagger / Knife
×2
Weapon Sai
×1
Weapon Scythe / Crescent Blade Serrated with Bar
×1
Bar 6L with Stop Ring
×1
Brick Sloped 45° 2 x 1 with Bottom Pin
×2
Wedge Plate 3 x 2 Left
×1
Wedge Plate 3 x 2 Right
×1
Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip]
×4
Plate Round 1 x 1 with Solid Stud
×1
Plate Special 1 x 2 with Clips Horizontal [Open O Clips]
×1
Brick Sloped 45° 2 x 1 with Bottom Pin
×2
Weapon Pike / Spear Flat End
×2
Brick Special 1 x 2 with Masonry Brick Profile
×1
Brick Special 1 x 2 with 2 Studs on 1 Side
×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.
