This goes back to the famous interview question: Was someone else in Godrick's Hollow that night? -- to which JKR replied, "No Comment."

Theories abound that it was Snape. I say it was Peter. Snape didn't know where the place was and I can't think of a reason for the Secret Keeper to tell him.

If Peter was there, he could easily have picked up the wand and move it to a safe hiding place. It was also Peter who found Voldemort and helped him to restore his body. Voldemort had the wand long before Snape or anyone else knew that Voldemort was back.

I've also been wondering whether the Pensive would allow Harry to review a memory from when he was fifteen months old. That would settle it.