I'm not sure about BO's but you can mail items to your alts using the Mail System in the Exchange near the bank, if you come into the Exchange from the stateroom, the mail system will be on your left toward the wall. Use Alt@Account name and then just drag and drop your items like any other MMO mail box.
EDIT: You also have to return to this mailbox to pick up any items you send.
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EDIT: You also have to return to this mailbox to pick up any items you send.