If it's clean, it is not from something that happened before the bottom painting. So, yes, it may well have happened when the boat
was moved when the OP wasn't present. I don't know if it would hold up in small claims court, though. It might be really hard to convince the judge that it wasn't from a keel
wrap. The gouge being clean and the rest of the bottom painted is the most logical pointer to something that happened while the boat
was being moved. Lead is pretty soft. Had a boat with external lead ballast that got coral
stuck in it during a grounding, on a reef.