I was under the impression that Kisuke's shop is where it is in order to stay out of the eyes of the Soul Society. Yet during the start of Season 4, Renji is "mooching" off the Urahara Shop, and it doesn't seem like Renji was in need to help at any time which would lead to Kisuke offering help, unlike with Rukia where it was shown that after she lost her powers she was approached by Kisuke.
So I am wondering if the Soul Society knew that Kisuke was set up in Karakura Town and thus directed Renji to seek his aid. If not, then how did Renji end up there?