Hm. I don't think I had anything too crazy back then. Most like anywhere from 9 to 11 in PER. I do recall that I read a piece of paper that was sitting on top of a box before my character spotted the mound, but I'm not 100% if they're linked or if it was just odd timing.
If you see a wooden crate with a note on top of it, read the note. That may trigger it.