There was an archeological excavation of the campsite and as I recall, the conclusion was that all of the victims whose remains were found were killed by blows to the head which doesn't quite match up with his story. lemme see if wikipedia says anything about this:

Hmm, the do talk about it, but only with regards to whether or not cannabilism could be determined. here is the link. it's a good article with a photo too!

Alferd Packer at Wikipedia

As for Alferd or Alfred - that's a toss up. He signed it both ways at different parts of his life. I believe that most common reference is to "Alferd""