Free tool
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
24 pieces in 16 part and color combinations, plus 1 minifigure.
LEGO counts 24 pieces. This inventory comes from a separate parts catalog and lists 28, 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.
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.
Tile Special 1 x 1 with Clip with Rounded Edges
Black ×2
Dark Bluish Gray ×2
Black is darker than Dark Bluish Gray.
LEGO's request form asks for the set number (5004929) and each piece's element ID, both listed above.
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Plate Special 1 x 2 [Side Handle Closed Ends]
×1
Plate Special 2 x 2 with Groove and Center Stud (Jumper)
×1
Pod, Round, Half Front with Batman Sticker
×1
Pod, Round, Half, Back with 1 x 2 Plate Light Bluish Gray with Batman Cave Sticker
×1
Tile Special 1 x 1 with Clip with Rounded Edges
Also in Dark Bluish Gray
×2
Tile Special 1 x 2 Grille with Bottom Groove
×1
Weapon Batarang
×3
Weapon Gun / Blaster with Hollow Studs on Sides and Inside Axle Holder
×1
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
×4
Brick Sloped 30° 1 x 2 x 2/3
×1
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)
×2
Tile Special 1 x 1 with Clip with Rounded Edges
Also in Black
×2
Tool Grappling Hook
×1
Plate Round 6 x 6 with Hole
×1
Tile 2 x 2 with Computer Screen, City Plan Print
×1
Tile Round 1 x 1
×1
Batman, Tiger Stripes Tuxedo
×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.
