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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
19 pieces in 12 part and color combinations, plus 1 minifigure.
The piece count includes the 4 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 (5373) and each piece's element ID, both listed above.
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Brick Sloped 45° 2 x 1 with Bottom Pin
×4
Brick Round 1 x 1 Open Stud
×3
Weapon Halberd / Axe
×1
Weapon Crossbow and Bolt
×1
Weapon Sword / Shortsword
×1
Technic Axle and Pin Connector Angled #2 - 180°
×1
Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top]
×2
Plate 2 x 3
×2
Technic Axle Towball
×1
Technic Pin Long without Friction Ridges
×1
Barrel 2 x 2 x 2
×1
Equipment Saucepan
×1
Chess Piece - Crown - Pawn
×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.
