No, traps do not apply concealment
The paragraphs following Concealment tell you to apply logical limitations to concealment based on specifically the ability to see the opponent clearly and how it would modify your chance to hit.
Concealment isn’t always effective. An area of dim lighting or darkness doesn’t provide any concealment against an opponent with darkvision. [...]
Varying Degrees of Concealment
Certain situations may provide more or less than typical concealment, and modify the miss chance accordingly.
Looking at it logically, "attack" traps do not adjust their aim to hit a particular individual, instead they are aimed at a particular location that will be attacked when the trap is triggered. An equivalent situation with a sentient attacker would result in the attack being considered to be into total concealment, ie 50% miss chance. However, given this is not the way traps work, the trap cannot see its target anyway, so concealment is meaningless.