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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
54 pieces in 36 part and color combinations, plus 1 minifigure.
LEGO counts 48 pieces. This inventory comes from a separate parts catalog and lists 58, including the 4 parts inside the minifigures; the two do not always count the same elements, so their totals differ. 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 (40175) and each piece's element ID, both listed above.
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Technic Link Tread with Beveled Edge
1 spare in the box
×14
Display Card, Police Storyboard Card 1
×1
Display Card, Police Storyboard Card 10
×1
Display Card, Police Storyboard Card 2
×1
Display Card, Police Storyboard Card 3
×1
Display Card, Police Storyboard Card 4
×1
Display Card, Police Storyboard Card 5
×1
Display Card, Police Storyboard Card 6
×1
Display Card, Police Storyboard Card 7
×1
Display Card, Police Storyboard Card 8
×1
Display Card, Police Storyboard Card 9
×1
Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]
×1
Plate Special Round 2 x 2 with Center Stud (Jumper Plate)
×3
Bracket 1 x 2 - 1 x 2
×2
Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip]
×1
Plate Special 1 x 2 with 1 Stud with Groove (Jumper)
×1
Tile Round 1 x 1 with Cookie Print
1 spare in the box
×1
Tile Round 1 x 1
1 spare in the box
×3
Tile Round 1 x 1
1 spare in the box
×1
Plate 2 x 4
×1
Plate 2 x 2 Corner
×1
Plate 1 x 1
1 spare in the box
×1
Bar 1 x 6 [Closed Studs]
×1
Bar 4L (Lightsaber Blade / Wand)
×1
Brick Special 1 x 2 x 2/3 with Studs on Sides
×1
Brick Special 1 x 2 with Pin
×1
Equipment Radio [Extended Handle, Expanded Speaker Grille]
×1
Equipment Cup / Mug [Plain]
×1
Tile 1 x 1 with Keypad Print
1 spare in the box
×1
Tile 1 x 4 with Black Diagonal Stripes Print
×1
Brick Curved 2 x 2 x 2/3
×1
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
1 spare in the box
×1
Plant, Bush 2 x 2 x 4
×1
Plate Round 1 x 1 with Solid Stud
1 spare in the box
×1
Technic Beam 1 x 3 Thick
×1
Tile Special 1 x 2 Grille with Bottom Groove
×1
Policeman, Bright Light Blue Shirt with Dark Blue Tie, Badge, and Radio on Belt, Dark Blue Hat with Badge
×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.
