It looks like a page out of one of those unofficial music books, looks quite similar to this. Like DevinS already said, they don't write this stuff down, unless for string arrangements maybe, for example Breaking The Habit.
The signatures looks suspicious to me. I'm not sure if everyone always had the same signature, but especially the BBB looks too sloppy. They all looks really off, Mike used to do the LP below his name but it totally doesn't look like him. Those really look like imitations. Is the one on the bottom supposed to be Rob? I'm also counting only 5 signatures.