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 (Build-a-Mini-2021) and each piece's element ID, both listed above.
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Piece checklist
Minifig Upper Body
14 pieces
Torso, Jacket, Mariachi Band, White Skeleton Print, Black Arms, White HandsBlackPart 973c03h27pr0002×1
Torso, Vest, Red and White Striped Undershirt Print, Yellow Arms and HandsBluePart 973c01h01pr0001×1
Torso Coral Bow Tie Print, Bright Light Blue Arms, Black HandsBright Light BluePart 973c29h03pr0002×1
Torso, Halter Top with White Flowers and Magenta Butterflies, and Magenta Heart Necklace Print, No Back Print, Yellow Arms and HandsBright PinkPart 973c01h01pr0014×1
Torso Jacket, Padded, Dark Pink Zipper, Pockets Print, Dark Pink Arms, White HandsDark BluePart 973c36h27pr0001×1
Torso Suit Jacket, Buttons, Pink Shirt, Magenta Scarf, Back Print, Dark Bluish Gray Arms, Yellow HandsDark Bluish GrayPart 973c12h01pr0001×1
Minifig Torso Brick Suit with Yellow HandsDark TurquoisePart 37191h01×1
Torso, Vest Top, Pink Dots, Black Trim, Buttons, Pockets Print, Yellow Arms and HandsDark TurquoisePart 973c01h01pr0020×1
Torso, Corset, White Blouse and Lavender Lace Up Back Print, Yellow Arms and HandsLavenderPart 973c01h01pr0012Element 6296569×1
Torso, Dark Red Bow Tie, Fur Print, Medium Nougat Arms and HandsMedium NougatPart 973c23h23pr0001×1
Torso Shirt with Dark Pink and Dark Turquoise Vertical Stripes Print, Dark Pink Arms, Yellow HandsWhitePart 973c36h01pr0001×1
Torso, Corset, Red Side Panels, White Lace, Trim, White Necklace with Black Pendant Print, White Arms, Yellow HandsWhitePart 973c27h01pr0032×1
Torso, Dual Molded Arms, Lab Coat, Badge, Lime Smudges, Back Lining Print, White Sleeves Pattern, Black Arms and HandsWhitePart 973g27c03h03pr0001×1
Torso, Dual Molded Arms, Shirt, Dark Blue Collar, Dark Turquoise Sided Print, White Sleeves Pattern, Yellow Arms and HandsWhitePart 973g27c01h01pr0001×1
Minifig Headwear
5 pieces
Hat Sombrero with Silver Ornate Wide Trim PrintBlackPart 90388pr0005×1
Minifig Head, Dark Brown Eyebrows, Moustache Thick, Chin Dimple, White Pupils PrintYellowPart 3626cpr9770×1
Minifig Head, Moustache, Goatee, Raised Left Eyebrow, Smile PrintYellowPart 3626cpr9829×1
Minifig Head, Reddish Brown Eyebrows, Red Lips, Face Paint and Open Mouth / Smile PrintYellowPart 3626cpr9782×1
Minifig Lower Body
3 pieces
Hips and Bright Light Blue Legs with 3 Black Toes/Claws PrintBright Light BluePart 970c29pr9819×1
Hips and Legs Under Dress/Robe with Skirt Denim with Buttons, Pockets and Stitching PrintMedium BluePart 36036pr9996×1
Hips with White Legs and Blue Boots PatternWhitePart 970c27pat28×1
Minifig Accessories
2 pieces
Sports Snowboard Small 2 x 6 with 2 Centered Studs, Dark Blue/White Stripes, Dark Pink/Dark Turquoise Shapes PrintDark AzurePart 93218pr0001×1
Balloon DogTrans-PurplePart 35692×1
Minifig Shields, Weapons, & Tools
1 piece
ToolboxOrangePart 98368×1
Tiles Round and Curved
1 piece
Tile Round 2 x 2 with Fruit Pie PrintTanPart 14769pr0033×1
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