On the way to lunch with Wolfshiem, Gatsby tells Nick both truthful elements and lies about his past. What two pieces of "evidence" does Gatsby produce to prove his story?

War hero:

"He reached in his pocket, and a piece of metal, slung on a ribbon, fell into my palm."

A photo from Oxford:

“Here’s another thing I always carry. A souvenir of Oxford days. It was taken in Trinity Quad — the man on my left is now the Earl of Dorcaster.”

It was a photograph of half a dozen young men in blazers loafing in an archway through which were visible a host of spires. There was Gatsby, looking a little, not much, younger — with a cricket bat in his hand."