My weapons aren't showing up in Sapien. While viewing the map in Halo CE the weapons are there, but in Sapien there not there.

I am assuming this is a multiplayer map. The reason you can't see them is because sapien will not display .item_collection files because they do not have a gbxmodel, all an item_collection is a spawn point for all of the weapons that it contains. If you need to see it to align it correctly in your map, place the .weapon file in your map where you want it, and then match the coordinates of your item_collection with the weapon file.