They didn’t need the kind of attention that would draw the group. The plan was, in able to find the blasted Tree of Life, they had to visit the Forbidden Forest frequently in order to map the area out. The map would be carted down with the same charms used in the Marauder’s Map and duplicated for each new-generation Marauder, with the original copy being added on to the aforementioned Marauder’s Map. They had Hagrid to help out with exploring the forest but no one else. And that was unfortunate because the forest was quite obviously a large place. It was obviously going to take a long time.