When you first spawn into the woodlands map, drive straight until you meet a creek. Take a right, an drive a little bit past the hill with the mission on it an stop so that you can go into Free Cam an turn your camera to face the other side of the creek, if you drove the right little bit you'll see the crate sitting there and all you gotta do from there is tap on it. You should be able to collect it from the other side of the creek, after you collect leave to go the main menu and reload the map! An sometimes if your lucky two will spawn over there. The second one spawning a little bit further back in the middle of a couple of trees, but most the time one will spawn but that could've just been my luck. Anyways there is a slight chance that the crate sometimes will not spawn, if you don see the crate just leave and reload the map, and bam it should be there. An you can drive to the other side of the creek to collect but this was just my lazy way of doing it.