Well ten Mr. Fantasy1111, that woud mean you've never read Time Trap, and that you know nothing of time travel.
The mask of time was retrieved in Time Trap by Vakama otherwise it wouldn't have been used by Vakama in 2003. Also, when the Toa were finished in the future, the space time continuum would have corrected itself and the Toa would have been sent back to there original time period, WITH their original memories. BOOM. Logic'd yo A$$ - nikolasalex