Now, hold on.
Cel-Shaded Deku took the cookie earlier, right?
But, when Cabbage asked if Cel-Shaded Deku had it, Cabbage was told "no."
For all we know, Cel-Shaded Deku might have been telling the truth, meaning that the cookie, therefore, was never in Zelda64's possession, as Zelda64 couldn't...