How to delete Inboxes that TBP duplicated ?

Somehow my Inboxes got duplicated, luckily only one of each pair continue to fetch new mail. I have removed all the duplicate messages but I can't find a way to delete the empty Inboxes themselves ?
Also my "Trash" file is 2GB but properties says there are zero messages ... I read that if I delete the msf file it will regenerate, but what if I delete the "Trash" file itself...what would be the procedure here ?
Thx Peter