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I have come across something very similar in my engine. I found metal in the oil filter so looked at the sump and found more metal. I had a leaking 4-6 valve cover so pulled that and found a bolt wedged very close to a exhaust cam lobe. Turns out it was a lifter carrier bolt being slowly machined by the cam! No damage to the cam or lifter. Another bolt next to where it came from was finger tight if that. When I removed the scavenge pump I noticed a roughness so took it apart to find a small piece of the bolt had gotten in there, dinged the drive gear and grooved the housing slightly. I pulled the 1-3 pump to look and it also had the same small damage. Not enough in either pump to jam it.
I replaced the lifter bolt and checked torque on all of them. I cleaned up the pumps and they are smooth running now. The car was running fine with all of this before! I have 90+% of the bolt intact so I'm hoping I have gotten the metal out of the engine and everything will be okay.
You need to find where that bolt came from! Good luck.
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