Takes a moment but I use the “transporting a chest full of gold from one castle to another - through hostile territory”. 

 One way transport to Castle “B” with my padlock 🔒 - then back to me (Castle “A”) with their padlock 🔒on the chest.  Then I remove my padlock 🔓 and send it back to Castle “B”. 

Thoughts on that? 

 Like it👍