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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
10 pieces in 9 part and color combinations, plus 4 minifigures.
The piece count includes the 16 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 (853570) and each piece's element ID, both listed above.
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Equipment Ball and Chain with 1 x 1 Round Plate
×1
Equipment Hose Nozzle / Gun with Side String Hole Simplified
×1
Equipment Radio [Extended Handle, Expanded Speaker Grille]
×1
Equipment Weapon, Loudhailer / Speaker / Blaster / Space Gun
×1
Tile 1 x 2 with '100' Banknote Print
×2
Equipment Dynamite Sticks
×1
Tool Crowbar
×1
Minifig Neckwear Backpack [Open]
×1
Equipment Handcuffs
×1
Policeman, Dark Bluish Gray Vest with Radio, Badge, and 'POLICE' on Back over Medium Blue Shirt, Dark Blue Cap, Sunglasses
×1
Policewoman, Bright Light Blue Jacket with Zipper, Radio, Badge, and Tie, Dark Blue Legs, Medium Nougat Hair
×1
Criminal Simon Sin, Orange Vest with #92116 and Waist Tied Prison Shirt, Black Hat, Moustache
×1
Criminal Carl Cold, Open Prison Shirt #86737 over Orange Top, Black Hair
×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.
