Yeah, I know some large ones have come from Guyana, Surimane, and French Guiana. I think this is the exception verses the rule. The biggest ones/one is from Bolivia. I think most of the pure Bolivians get large, over 16". The environment differences between the two locations is vastly different...
@tortadise I did not get her from Mike but he did have her at one time. She has a patchy history at best, I do believe that she was imported from Surimane. At least that is what I could gather, any info you have would be appreciated.