There is lots of compelling evidence of his stuff in private peoples hands and in private collections. It just stays private, there is no incentive for it to go public because there is a scientific blockade on it. Look into he Minnesota Iceman, I have talked to people that saw it in he 60s when it was on tour, two scientists inspected it took photos and said it was real. Then some fake replica went on tour and the original disappeared after the government allegedly siezed it.