phone 5 piece fell out
Hello I was opening up my iphone 5 to try to dry it out after water damage. A piece fell out that looks like a very small black cube shaped metal part with a circular hole in it. I did not see any pictures of it in an exploded parts diagram when I searched on google. I put my phone back together and everything seems to be working fine. I just cannot find out where this piece came from. 2 pictures the second is it flipped upsidedown. Thanks.