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.
Duplo Figure with Rounded Head with Peg Leg, Jacket with Ascot, Eyepatch Print (Pirate)Dark BluePart 51741pr0018Element 4292421×1
Duplo Figure Pirate with Head Wrap, Dark Bluish Gray Legs, Red and White Striped Vest PrintNougatPart 55837pr0001Element 4292426×1
Duplo Figure with Rounded Head with Dark Green Legs, Chest Belt with Dynamite, Eyepatch Print (Pirate)NougatPart 51741pr0011Element 4292231×1
Duplo Figure with Pirate Hat, Peg Leg, Chef Jacket, Eyepatch PrintWhitePart 47394pr0003Element 4294351×1
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.