Who saw the School's secret code before ?

[Bob]

I think it's the same "number" Sayaka worte with blood before die, right ?

[Protocol27]

Yep, 11037 (Makoto even mentions a friend left the message for him before the class trial).

[Whitnee]

He said it was a message that a old friend left him when he was in a bad situation so he left it there incase they were ever in the same spot. Ironic because they not only did infact get in a bad situation, but it was literally the exact situation as before.