Iry
Legend
The game is extremely consistent that objects can be hidden, and specifically mentions traps as an example. Emphasis below is mine.Traps can't hide. They can only be unseen.
PHB 177 "What Can You See? One of the main factors in determining whether you can find a hidden creature or object is how well you can see in an area"
PHB 178 "Investigation. When you look around for clues and make deductions based on those clues, you make an Intelligence (Investigation) check. You might deduce the location of a hidden object, discern from the appearance of a wound what kind of weapon dealt it, or determine the weakest point in a tunnel that could cause it to collapse."
PHB 178 "Finding a Hidden Object. When your character searches for a hidden object such as a secret door or a trap, the DM typically asks you to make a Wisdom (Perception) check."
PHB 182 "Noticing Threads. Use the passive Wisdom (Perception) scores of the characters to determine whether anyone in the group notices a hidden threat."
PHB 183 "Vision and Light. The most fundamental tasks of adventuring—noticing danger, finding hidden objects, hitting an enemy in combat, and targeting a spell, to name just a few—"
PHB 203 "Divination spells reveal information, whether in the form of secrets long forgotten, glimpses of the future, the locations of hidden things, the truth behind illusions, or visions of distant people or places."
Oh, and while Sage Advice is not an actual ruling, I just wanted to add this here because it's hilarious and insulting to Find Traps. =D

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