His staffers forwarded the pics to him?
As I understand it the lawmaker sees a very small percentage of correspondence.
Biden is probably making it up. Or perhaps more accurately, he is incorporating himself into a story he has heard in the past. It possible his cannibalism story grows out of true story involving George HW Bush called the
Chichijima Incident. It is a kind of plagiarism.
I had a high school history teacher who would do a similar thing. He would recount war stories, mostly from WWII, but in his retelling the events took place during the Vietnam War and he was personably involved.