there is a possible way around this, but it requires of you to know how to programm PB plug-in and/or use relogger. Basically you need to make a profile switcher, which would change your harverst profile to maneuver one. Maneuvering profile guides your toon to the mailbox, and mails all stuff you've got and etc. When your bags are empty, it gets you out of the cave, then switches back to harversting profile. Sounds easy, but I have no idea which commands to use in order to make a decent switching profile in PB. If anyone would be kind enough to make such profile and post it here, I'd really appreciate that =)