By the looks of that whatever it was has long since been repaired.
Never worry about crap you can see, it'll never get picked up let alone pumped around. I've found tappet lock nuts, cam gear nuts, bits of cam chain and all sorts of UFOs. It's the dirt smaller than 10 micron that causes the damage, it gets pumped around and around with only a small chance of getting caught in the bypass oil filter, hence why hydraulics don't tend to use filters with a bypass