I have never seen this, nor anybody in my alliance know how to do it. In the alliance of someone I know, a player joined, was in the aliance for a few days taking titan hits, etc… and then a message appeared something like “[players name] sent you battle items”. It contained a titan banner, a hurricane and some other stuff that in this low level alliance would have been hard for someone to craft. Then, suspiciously, the player promptly left the alliance.
Anybody know anything about this?