I would say, planted, called/told Tina about it very shortly thereafter and told her exactly where to get it, it was designed to be found in hours/days/weeks. Probably the fall before the "find". It wasn't supposed to sit there for months. While a "popular" place for fisherman at the time, popular, is relative, a couple guys on a weekend? Or 30 guys every day? Popular, and known, and actual use...is subjective. I would guess, it was a few people, after work or weekend, weather permitting, during season. WHich, isn't really risking it being found, for a short period of time, by regular users.