Actual proof is hard to come by. There was a poster here a couple of yrs ago, who related how she had memories of a past life w another guy, in another town, during the pioneer days, i believe. Though she had never seen the place before, she knew stuff about it. There were other details. Quite interesting. Sorry, forgot her name.
I have tried some past life focussed meditations. May have gotten something. But then, as somebody pointed out, these could be memories from the group subconscious.