Trap Lid

The Trap Lid is a treasure in. It is actually a metal.

Seafloor Resort
There is a Trap Lid completely submerged in a corner near the center of sublevel 2 of the Seafloor Resort. To collect this treasure, you must throw 1 Blue Pikmin at it.

Hero's Hideaway
There is a Trap Lid hidden inside a patch of grass in the southwestern corner of the overworld. It is guarded by four Tusked Blowhogs, which should be defeated before attempting to collect it. To collect this treasure, you must throw 1 Pikmin at it.

Cavern for a King
There are 10 Trap Lids inside of the Baldy Long Legs roaming around the center of sublevel 15 of the Cavern for a King. To collect them, you must first defeat the Baldy Long Legs, then throw 1 Blue Pikmin or Winged Pikmin at each treasure, or 1 Pikmin if it happens to land outside of the water or on frozen water.