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LEGO Missing Piece Checker

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.

Olivia's Invention Workshop

Checking

3933 Olivia's Invention Workshop

82 pieces in 44 part and color combinations, plus 1 minifigure.

LEGO counts 81 pieces. This inventory comes from a separate parts catalog and lists 86, 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.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

White 14 pieces

  • Brick 1 x 2 x 2 with Inside Stud Holder White Part 3245c Element 6550139 or 4113261 ×2
  • Brick Curved 1 x 2 x 1 1/3 with Curved Top White Part 6091 Element 6285777 or 609101 ×1
  • Brick Sloped 75° 2 x 2 x 3 [Solid Studs] White Part 98560 Element 6552137 or 6004491 ×2
  • Brick Special 1 x 1 Studs on 4 Sides White Part 4733 Element 4111971 or 473301 ×1
  • Brick Special 1 x 4 with 4 Studs on One Side White Part 30414 Element 6550167 or 4143254 ×1
  • Cupboard 2 x 3 x 2 with Hollow Studs White Part 92410 Element 4619665 ×1
  • Lever Small Base with Black Lever White Part 298c02 Element 73737 1 spare in the box ×3
  • Plate Special 1 x 1 with Tooth White Part 49668 Element 6601935 or 4224792 ×2
  • Plate Special 1 x 2 [Side Handle Closed Ends] White Part 48336 Element 6552125 or 4222017 ×1

Light Bluish Gray 12 pieces

  • Plate 1 x 3 Light Bluish Gray Part 3623 Element 4211429 or 3623194 ×2
  • Plate Round 1 x 1 with Solid Stud Light Bluish Gray Part 6141 Element 4211525 1 spare in the box ×6
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] Light Bluish Gray Part 4085c Element 4211479 ×2
  • Plate Special 1 x 2 with Door Rail Light Bluish Gray Part 32028 Element 4211568 ×2

Medium Azure 11 pieces

  • Brick 2 x 2 Medium Azure Part 3003 Element 6603316 or 4653970 ×5
  • Brick 2 x 4 Medium Azure Part 3001 Element 6603313 or 4625629 ×4
  • Plate 1 x 6 Medium Azure Part 3666 Element 6603312 or 4625036 ×1
  • Tile 1 x 4 with Groove Medium Azure Part 2431 Element 4624705 ×1

Bright Pink 8 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Bright Pink Part 54200 Element 4599538 1 spare in the box ×2
  • Brick Special 1 x 1 with Stud on 1 Side Bright Pink Part 87087 Element 4621554 ×1
  • Cupboard 2 x 3 Drawer Bright Pink Part 4536 Element 4599534 ×2
  • Panel 1 x 2 x 1 [Rounded Corners] Bright Pink Part 4865b Element 6476739 or 6146231 ×3

Dark Bluish Gray 7 pieces

  • Equipment Binoculars Dark Bluish Gray Part 30162 Element 4587887 or 4211051 ×2
  • Plate Round 1 x 1 with Solid Stud Dark Bluish Gray Part 6141 Element 4210633 1 spare in the box ×2
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Dark Bluish Gray Part 3794b Element 4211119 ×3

Black 6 pieces

  • Brick Special 1 x 1 with Clip Vertical [Thick U Clip, Solid Stud] Black Part 60475a Element 4515356 ×4
  • Plate 1 x 2 Black Part 3023 Element 302326 ×1
  • Plate Special 4 x 6, Studs on 3 Edges with Blackboard Print Black Part 6180pr0003 Element 4653274 ×1

Dark Purple 6 pieces

  • Tool Drill, Electric Dark Purple Part 55297 ×1
  • Tool Hammer Cross Pein [6-Rib Handle] Dark Purple Part 55295 ×1
  • Tool Oil Can [Smooth Handle] Dark Purple Part 55296 ×1
  • Tool Screwdriver with Narrow Head [6-Rib Handle] Dark Purple Part 55298 ×1
  • Tool Wrench / Spanner Open End [6-Rib Handle] Dark Purple Part 55299 ×1
  • Tool Wrench / Spanner, Box [6-Rib Handle] Dark Purple Part 55300 ×1

Light Aqua 5 pieces

  • Plate 2 x 6 Light Aqua Part 3795 Element 4616648 ×5

Trans-Red 4 pieces

  • Brick Round 1 x 1 Open Stud Trans-Red Part 3062b Element 6514235 or 6238673 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×1
  • Rock 1 x 1 Jewel / Gem 24 Facet Trans-Red Part 30153 Element 6513969 or 6247785 ×1

Trans-Green 3 pieces

  • Brick Round 1 x 1 Open Stud Trans-Green Part 3062b Element 6514234 or 6238046 ×2
  • Tile Round 1 x 1 Trans-Green Part 98138 Element 6514194 or 6274742 1 spare in the box ×1

Blue 2 pieces

  • Bracket 1 x 2 - 2 x 2 Blue Part 44728 Element 6117968 or 6037412 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Blue Part 3794b Element 379423 ×1

Trans-Light Blue 2 pieces

  • Brick Round 1 x 1 Open Stud Trans-Light Blue Part 3062b Element 6514238 or 6238677 ×2

Orange 1 piece

  • Plate Round 1 x 1 with Solid Stud Orange Part 6141 Element 4157103 1 spare in the box ×1

Trans-Clear 1 piece

  • Equipment Bottle / Erlenmeyer Flask with Trans-Bright Green Fluid Pattern Trans-Clear Part 93549pat0001 Element 6530023 or 6447576 ×1

Minifigures 1 figure

  • Olivia - Orange Top, Lime Skirt Minifigure, checked as a whole figure ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

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 LEGO

Buy the piece

Mark 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.

Keep a record

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.

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