why they notified them? They notified the Nevada Gaming Board because law dictated they must do so:
a scheme that ultimately cost him his job. Nor was he aware that Vaccaro had notified the Nevada Gaming Control Board the previous day,
.......
“Tracking money in this day and age is a lot more elaborate than at any time,” longtime Las Vegas bookmaker Vinnie Magliulo said. “There are reporting requirements. Over a certain threshold, people have to produce identification. The beauty of our industry is it’s fully transparent, regulated, licensed, taxed and has tremendous oversight.
https://www.reviewjournal.com/sports/betting/las-vegas-bookmakers-know-a-fix-when-they-see-one/