This seems as good a time as any to point out that boxing history isn't a thing. No one is really interested in boxing before they grew up watching. This whole forum is actually just veiled language and code for an international betting scam. There of late seems to be a few posters not in on the "joke".
This would explain why no film of Greb Zale-Graziano Young Pep young Robonson young Dempsey Sanders Ramos Limon-Baltazar Mercado-Cobb