Mystery part... anyone know where this goes on a civic?

A while back when I was cleaning the floor, I found this near the front drivers corner of the car.
Right away I was like "I swear I installed the woodruff key on the crank pulley" And I looked... the woodruff key was installed, this was actually smaller, but similar shape. also this is very magnetic.
here it is next to the installed woodruff key.
and here it is on a wheel stud, to give you an idea of how small it is.
I have no clue where it could be from, but I'm pretty sure it fell off my civic at some point.
any ideas
Right away I was like "I swear I installed the woodruff key on the crank pulley" And I looked... the woodruff key was installed, this was actually smaller, but similar shape. also this is very magnetic.

here it is next to the installed woodruff key.

and here it is on a wheel stud, to give you an idea of how small it is.
I have no clue where it could be from, but I'm pretty sure it fell off my civic at some point.
any ideas
