[Death by Mirrors]

Okay, I'm a little confused. From what has been discovered through hints so far, even if those three nines I guessed are all wrong, we already know the code starts with 1375, and there's a 4, 2 and 5 in there. Wouldn't that make 7 cypher already?

To clarify, 4 cypher 4 location means neither one of the unknown colors and numbers is purple, nor a 9?

Well then, next try.

1375848285