I think he's always just brought 2-3 basses on tour.
Back in the Core, Purple, and I believe Tiny Music, days, he just had two Schecter J basses he played the Blue on with the Phillies sticker and a white one.
Then starting in with No. 4, he started using two Schecter Model Ts and one of his old J basses (usually, the white one.)
Now I think he just uses two or three Model Ts. Except at KROQ's Weenie Roast and Jimmy Kimmel live, where he used a Schecter P-bass, and I believe two Model Ts as well.