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 (9171) and each piece's element ID, both listed above.
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Piece checklist
Yellow
7 pieces
Duplo Figure, Early Child, Hair Swept Left Black, Blue Legs, Blue Overalls PrintYellowPart 75271pr0014Element 75507×1
Duplo Figure, Early Child, with Straight Hair Black, Red Legs, Red Collar and Buttons PrintYellowPart 75176pr0011Element 75501×1
Duplo Figure, Early, Hair Bob Black, Dark Pink Legs, Buttons and Medium Green Flowers PrintYellowPart 74298pr0003×1
Duplo Figure, Early, Hair Bob Black, Red Legs, Red Buttons and Gray Wrench, Glasses PrintYellowPart 74298pr0007Element 75510×1
Duplo Figure, Early, Hair Bob Light Gray, Green Legs, Buttons and Medium Green Collar PrintYellowPart 74298pr0006×1
Duplo Figure, Early, Hair Bob Light Gray, Medium Green Legs, White Collar and Pink Pendant, Glasses PrintYellowPart 74298pr0018Element 75484×1
Duplo Figure, Early, with Short Parted Hair Light Gray, Black Legs, Argyle Sweater PrintYellowPart 74511pr0004×1
Blue
4 pieces
Duplo Figure, Early Child, Hair Swept Left Black, Red Legs, Red Collar and Buttons PrintBluePart 75271pr0013Element 75513×1
Duplo Figure, Early, Hair Bob Brown, White Legs, Yellow Scarf and Airplane, Turned Up Nose PrintBluePart 74298pr0010×1
Duplo Figure, Early, with Short Parted Hair Black, Black Legs, White Shirt, Light Blue Tie PrintBluePart 74511pr0001×1
Duplo Figure, Early, with Short Parted Hair Light Gray, Dark Gray Legs, Argyle Sweater PrintBluePart 74511pr0008Element 75488×1
Light Green
3 pieces
Duplo Figure, Early Child, with Bonnet White, Medium Dark Pink Legs, White Bib with Medium Dark Pink Lace PrintLight GreenPart 75272pr0007×1
Duplo Figure, Early Child, with Bonnet White, Yellow Legs, Buttons and Collar PrintLight GreenPart 75272pr0002×1
Duplo Figure, Early, Hair Bob Light Gray, Yellow Legs, White Collar and Heart Buttons PrintLight GreenPart 74298pr0011×1
White
3 pieces
Duplo Figure, Early, Hair Bob Black, Red Legs, Two Red Buttons and Blue EMT Star of Life PrintWhitePart 74298pr0005×1
Duplo Figure, Early, Short Afro Hair Black, White Legs, Red Buttons, Star of Life PrintWhitePart 74361pr0001×1
Duplo Figure, Early, Short Afro Hair Light Gray, Blue Legs, Red Buttons, Medium Green Neck PrintWhitePart 74361pr0002×1
Black
2 pieces
Duplo Figure, Early, Fire Helmet White, Black Legs, Gold Buttons PrintBlackPart 74365pr0001×1
Duplo Figure, Early, with Flat Cap Blue, Blue Legs, Three Buttons and Police Badge, Nose Pointing Up PrintBlackPart 74432pr0020×1
Green
2 pieces
Duplo Figure, Early Child, with Bonnet White, Yellow Legs, Yellow Bib with Red Lace PrintGreenPart 75272pr0006×1
Duplo Figure, Early, with Short Parted Hair Light Gray, Black Legs, White Vest, Glasses PrintGreenPart 74511pr0002×1
Medium Green
2 pieces
Duplo Figure, Early Child, with Bonnet White, Medium Green Legs, White Bib with Dark Pink Lace PrintMedium GreenPart 75272pr0005Element 75479×1
Duplo Figure, Early Child, with Straight Hair Light Yellow, Dark Pink Legs, Yellow Collar and Dark Pin Buttons PrintMedium GreenPart 75176pr0009Element 75463×1
Red
1 piece
Duplo Figure, Early, Hair Bob Light Gray, Yellow Legs, White Collar and Buttons, Glasses PrintRedPart 74298pr0012×1
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When a piece really is missing
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