How old is this gouge


Hey pros, I’m trying to isolate a leak and after I thought I had it located and fixed I found this. I had a guy working in this area after the fix and I think he did it. I don’t care if he did it, I just need to know if this was older and the source of the original leak.

Note the clay is washed/wiped away in the crack, possibly from recent impact. It’s about an inch long. Forensics fun.