Per only hope’s suggestion of sending to front of park, this is what I did. As for where to go, at Galaxy’s Edge they can do this at the Droid Depot, the Resistance Supply or the First Order Cargo. Alternatively there are some shops on the Main Street of the park, like ABC Commissary I believe it’s called. As also mentioned, it will take about three hours for it to get to the front of the park so if you plan to store do so early so the sabers are there before evening. And as for where to pick up, when you’re heading for the exit, to the left there’s a large Coca Cola place, the pick-up is just beyond there in a corner.