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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.
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 (5398) and each piece's element ID, both listed above.
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Brick 1 x 2 with 'Octan 3.09' Print
×1
Brick 1 x 2 with TV Screen and 3 Buttons Print
×1
Brick 1 x 3 with Radio and Tape Player Print
×1
Brick Sloped 33° 3 x 2 with Black "4" and Red Stripes Print
×1
Brick Sloped 45° 2 x 2 with Black '4' over Red and Green Stripes Print
×2
Brick Sloped 45° 2 x 2 with Phone and Minifig Print
×1
Brick Sloped 45° 2 x 2 with Radar Screen Print
×1
Tile 1 x 2 with Black "POLICE" and Red Line Print
×2
Tile 1 x 2 with Coast Guard Print
×2
Tile 1 x 2 with Danger Chevrons Red Print
×2
Tile 1 x 2 with Hand Print and Striped Shirt Print
×1
Tile 1 x 2 with Officer Picture and Handprint Print
×1
Tile 1 x 2 with Simple Computer Keyboard Print
×2
Tile 1 x 4 with 'Octan' Logo Print
×2
Tile 2 x 2 with Gauges Print
×1
Tile 2 x 2 with Octan Logo and Text Print
×1
Brick Sloped 45° 2 x 1 with Bottom pin, with 3 White Buttons, Red and Green Lamps Print
×2
Brick Sloped 45° 2 x 2 with Flight Control Print
×1
Tile 1 x 2 with Video Tape and Reels Print
×2
Tile 1 x 2 with '100' Banknote Print
×4
Brick Sloped 33° 3 x 2 with Red '1' and Yellow Outline Print
×1
Brick Sloped 45° 2 x 2 with Red '1' in Yellow Outline Print
×2
Brick Sloped 33° 3 x 2 with Red "5" and White Stripes Print
×1
Brick Sloped 45° 2 x 2 with Red/White '5' and White Stripe Print
×2
Brick Sloped 33° 3 x 2 with Red '3', Black Triangle Print
×1
Brick Sloped 45° 2 x 2 with "3" over Black Stripes Print
×2
Brick Sloped 33° 3 x 2 with Red '2' over Two Green Stripes Print
×1
Brick Sloped 45° 2 x 2 with Red '2' and Green Stripes Print
×2
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.
