The itinerary. I am sure it will. I only kept my ticket stubbs cos I knew I could use them as evidence when the time arrived. An old Phils gf of mine knew a bit about this sort of thing and I had looked into it a little bit. Although I didnt know much about what I was doing, back then, I knew I needed to hang on to receipts so I did.
On the visa stamp. I asked that very question myself and I be dammed if I can remember....if I find out I will get back to you. In the meantime I am sure someone else will recall the length of time it is valid for.