Metal caps(?) from rear differential??

2017 TRD Off Road 6spd @ 44.448miles. I just drained and filled rear differential with Red Line 75w-85 GL-5. When I removed drain plug, I noticed something was stuck on magnet. Two metal pieces concave shape, kinda look like tip of bolt or something. It is very thin pretty much like metal plating that came off. Any idea where they came from? Also should I be concerned about it?

 

Looked like it’s what @whatstcp mentioned above. The magnet did it’s job.

 

Same thing came out of mine a week ago. Looks like machining flash from the holes for the studs.

 

I've found this a few times when I've done regears on 8.75 elocker diffs. Always 2 of them.

 

That is the final chip from a drilling operation as the drill breaks thru . Magnet did its job .

 

Seen in 2nd and 3rd gens (if I recall) (without rehashing that it is definitely a drill or tap remnant)

https://www.tacomaworld.com/threads/metal-in-rear-diff.665779/

https://www.tacomaworld.com/threads/surprise-found-in-diff.705904/