Gambling losses is a clue.
This is to me larger than one person.
Some exceptionally rough people are involved with sports betting.
Doesn’t have to be sports betting. Indian casinos are everywhere. There’s 3 in and around Jacksonville. In some ways legalized gambling is rougher. Mobsters can beat you up, an Indian casino can hose your credit rating and foreclose on your house.
On the other hand, a clever thief would cite “gambling loses” when he really hid all the stolen money in an offshore account (or maybe in an old suitcase).
“This is to me larger than one person.”
Somewhere there is an auditor or similar person just above the culprit in the chain who needs to be asked how this got missed.