A lot of guys seem to think just having a zip tie in the area of the latch is sufficient. I've seen a ton of railboxes on property with the front pins zip tied OPEN or the rears zip tied backwards where tou can just turn it and it cones free from the katch and tie.
Friend of mine brought three loads from the railyard and THEN asked me if we were supposed to do anything with the rear pins. Supe only told him to zip tje front......
My sup gave me a quick talk about the latches and need for zip ties. A fellow driver later explained what to look for as far as the position of the latch, and THEN zip tie as a second layer of protection from popping off. Thank God for other drivers lol