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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
38 pieces in 19 part and color combinations, plus 2 minifigures.
The official piece count includes the 18 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 (71779) and each piece's element ID, both listed above.
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Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Medium
1 spare in the box
×3
Dish 2 x 2 Inverted [Radar]
×2
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)
×1
Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring]
×3
Plate 1 x 2
×3
Tile Special Round 2 x 2 with Hole
×2
Wedge Plate 2 x 2 Right
×3
Plate Round 1 x 1 with Open Stud
1 spare in the box
×2
Weapon Scythe / Crescent Blade Serrated with Bar
×3
Weapon Spear Tip with Fins
1 spare in the box
×2
Brick Round 2 x 2 with Axle Hole
×2
Rock Boulder 4 x 4, Top
×1
Sphere with Opal Trans-Clear Core
×3
Tile Round 1 x 1
1 spare in the box
×1
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
1 spare in the box
×3
Plate Special, 3 Sphere Holders
×1
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]
×1
Plate Special 1 x 1 with Hole Through Stud, 3 Bars and 3 Bar Holes
×1
Sphere with Pearl Gold Core
×1
Lloyd - Dragon Power Spinjitzu
×1
Imperium Droid, Black, Blades
×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.
