So I changed my fine synthetic snobby wine

Did the diffs too. Front was like new since Ive hardly been in 4wd. Installed filtermag, wiped magnet by sensor with qtip only got color. Rear fluid was dark grey and inside of cover got wiped clean. Filtermag installed. magnet by sensor covered in metal, took 4-5 qtips to clean debris. Attached to the inside magnetic end of the fill plug was this piece of bent metal:


Now I wish I would have taken a picture of the inside of the diff, but I didn't. It got windy as hell as soon as I had the diff cover off and all kinds of crap was flying on the wind.
When we found this piece of metal, we of course looked into diff to see if we could find a break in a part or something. We could see what looks like this same piece of metal about 5/16" wide and 3/4" long, but not bent and still in place. It looks like this piece (When not broken off and bent) is flat and installed to the left of the ring gear as like a flat finger that orients the assembly left of the ring gear. Clearly the piece I have broke off a different area than what we could see.
Looks like a trip to the dealer. I am glad to find it before it's a bigger issue or something gives way.
Anyone have a clue what it is ?