The Tumbler was mailed to the first character you logged onto after purchasing the DLC. If you deleted your character after you logging on but before you grabbed the mail from the postmaster, then the tumbler is gone.
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here is the thing i deleted my first character when i was having trouble getting any content (ghost shell, ship and tumbler) got fustrated and deleted the character with nothing in the postmaster and then made a new character and i had the ghost shell and ship from my limited edition but no tumbler.