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.
Technic Pin with Friction Ridges Lengthwise and Center SlotsBlackPart 2780Element 4121715 or 2780261 spare in the box×2
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×2
Technic Beams Special
3 pieces
Technic Beam 1 x 2 with Ball Joint Straight, Smooth BallDark Bluish GrayPart 64276Element 6136458 or 6030824×2
Technic Beam 1 x 3 with Ball Joint in MiddleDark Bluish GrayPart 98577Element 6001085×1
Technic Bushes
3 pieces
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718171 spare in the box×3
Technic Connectors
3 pieces
Technic Axle Connector 2 x 3 with Ball Socket, Open Lower Axle HolesBlackPart 93571Element 4610948×3
Technic Special
2 pieces
Technic Ball Joint with Through Axle HoleBlackPart 53585Element 4286267×2
Stickers
1 piece
Sticker Sheet for Set 70202-1[No Color/Any Color]Part 14131Element 6036269×1
Supports, Girders and Cranes
1 piece
Support 1 x 1 x 5 1/3 Spiral Staircase AxleBlackPart 40244Element 4155558×1
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.
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.