Henbane River has nine Prepper Stashes hidden away from prying eyes. They are listed as they (roughly) appear from northwest to southeast, in each of the subregions. Don’t forget that some stashes have additional rewards (as well as money and perk magazines); find these in the in-game journal and by searching within the location. Gather these stashes right now; they grant you three Perk Points for each one you uncover!