There's nothing in the mating part for it to match up to in that joke so I doubt it. I take pictures as I'm disassembling things with parts. Still miss the item I need to locate though. the other rectangular holes have contacts in them for the wire to push lock into. That extra part is clearly not shaped the same.
Can't tell, but it almost looks like something used to live at the end of the spring. Maybe inside the spring to keep it from collapsing and maybe act as a stop.
KnurledNut had it right. It goes where I added the yellow box in the pic- jaws facing out. It keeps the two halves of the housing locked together on that corner.