Okay, I was really excited about the mailboxes... at first. but they seem to be working like nothing more than a fancy regular box. No special functionality. I attempted to drop some stuff into the box with an unfriended character... and got the same error message I would if I was trying to drop stuff in a locked-down box marked anyone. "you have to be a friend". Switch it to secure... and anyone can take stuff out of it. There is no difference between this and a regular box that I can see.