Jae Mil

2005 Silverado 2500HD 6.0 utility bed. 10.5in 14 bolt 4.10 gear rear end. I recently acquired this truck and did the rear diff fluid today. When I took the cover off, the magnet was covered in metal. More concerning is there are pieces of metal lying in the bottom. Not teeth, it's almost like a bearing retainer. I've been a mechanic for 14 years but haven't ever messed with inside a rear end. I really just need help to identify the broken pieces so I can make the repair. Any and all help is much appreciated.