I took a picture of the part so you guys can see it.

No idea where the hell it goes.

Assuming it goes somewhere near the entrance to put a small amount of pressure on the stylus and keep it aligned. And then came became loose, and was blocking the stylus. Then when I shook the phone, it entered the cavity and fell to the bottom.

It's also possible the shape has changed a bit, since when I was trying to get the stylus in a few times, I put a little pressure on it, and might of bent.

It really doesn't make sense since there was nothing else broken in there, and couldn't find something the shape of a tall building where this piece can slide over.

Oh well, good thing it's not needed. And even better I didn't bother with nokia.

If anyone that is reading this takes apart their n900 sometime in the future, and this part is intact, please take a picture of it. Would love to know how this piece was on here.

Thanks.