In Backup Exec restore, select the mailbox and start the restore. The only condition for restore to work is that the mailbox shoud be created with same name and also corresponding user must be created. The mailbox also needs to be activated. Apart from this, all other options are not relevant for exchange mailbox restores. The settings that you are talking about, apply only to database restore and not individual mailbox restore. So, ignore those settings and proceed with restore.
Please mark it a solution, if this is useful.
Thanks