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.
LEGO's request form asks for the set number (8771) and each piece's element ID, both listed above.
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Piece checklist
Medium Blue
25 pieces
Brick Curved 2 x 2 x 2/3 Two Studs and Lip EndMedium BluePart 41855Element 4163719×2
Brick Curved 2 x 2 x 2/3 Two Studs and Lip End with Four White Lines PrintMedium BluePart 41855pr0011Element 4221033×1
Brick Wedged, Curved 1 x 2 x 2/3 No Studs, Wing EndMedium BluePart 47458Element 4218578×6
Brick Wedged, Curved 2 x 3 x 2/3 Two Studs, Wing EndMedium BluePart 47456Element 4218566×4
Fairing 1 x 2 Stepped with Two PinsMedium BluePart 47501Element 4218584×4
Large Figure Foot, with Rotation Joint Ball Half [Vertical Side]Medium BluePart 47430Element 4238416 or 4216361×2
Large Figure Mask / Visor, JaykoMedium BluePart 47471Element 4242704 or 4220679×1
Large Figure Torso with Jayko Print (Series 1)Medium BluePart 47477c01pr0001Element 4220492×1
Technic Brick Special 2 x 2 with Axle Hole, Rotation Joint Ball Half [Vertical Side], Vertical Axle Hole EndMedium BluePart 47431Element 4216366×2
Technic Brick Special 2 x 3 with Pin Holes, Rotation Joint Ball Half [Vertical Side], Rotation Joint SocketMedium BluePart 47432Element 4218097×2
White
10 pieces
Technic Rotation Joint Ball Loop with Two Perpendicular Pins with FrictionWhitePart 47455Element 6352203 or 4298040×10
Light Bluish Gray
6 pieces
Large Figure Head, Round Top with Jayko PrintLight Bluish GrayPart 48819pr0002Element 4221021×1
Large Figure Shield Holder with Technic AxleLight Bluish GrayPart 47474Element 4244143 or 4220895×1
Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Ball Half [Horizontal Top], Rotation Joint SocketLight Bluish GrayPart 47452Element 4218281×2
Technic Brick Special 2 x 3 with Pin Holes, Rotation Joint Ball Half [Horizontal Top], Rotation Joint SocketLight Bluish GrayPart 47454Element 4218191×2
Blue
1 piece
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×1
Reddish Gold
1 piece
Large Figure Weapon Sword, Jayko / King Mathias (Series 1)Reddish GoldPart 47460Element 4220674×1
Trans-Clear
1 piece
Dish 2 x 2 Inverted [Radar]Trans-ClearPart 4740Element 6514246 or 62453061 spare in the box×1
[No Color/Any Color]
1 piece
Large Figure Shield with Knights Kingdom Jayko Hawk Print[No Color/Any Color]Part 48080Element 4220535×1
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of the instructions. This checker lists both.
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