We know how incredibly clever and resourceful Roth was - Lethal!

If Roth couldn't uncover Michael's “hidden interests, links, undeclared ownership and control in casinos” the chances of “the Commission's investigative staff uncovering Michael's hidden interests” is Buckleys and none!

Geary said Michael "owned or controlled three hotels" seemingly speculation due to their licence dealings but I doubt any direct links to Michael was uncovered

If Geary had uncovered the slightest whiff Geary would have squeezed Michael back with exposure or at least threatening Michael with an investigation for “Michael squeezing him via the hooker murder”

Everybody undoubtedly knew who Michael really was that Michael came to Nevada masquerading as 'legitimate' decent businessman - in his oily hair, dressed up in those silk suits - for 'legitimate' gambling business after consolidating his nefarious power in New York
However proof is scarcer than hen's teeth!