Had she kept the money and said nothing and it belonged to either the mafia or a cartel, they would have eventually found her.
It would be nice to find out who the owner was and why they had $7.5 million in cash........
The fact that they advertised this doesn't prevent them from harm in the future.
I smell a Hollyweed thriller coming soon to a theater near you .. that and pile(s) of old 100 dollar bills.
After getting an attorney, I would have the money checked for drug residue - heroin, opium, THC, PCP, etc. If it was clean, then I’d ask the IRS what could be legally done with it. If they say, it’s yours, legally, then get a good investment advisor/bank.
If it is dirty (assuming the original owners hadn’t contacted them), then I’d give it to the police. If no one claims it after a certain amount of time, you’d get it but keeping your name anonymous would be almost impossible.
I’d love to hear the explanation the “owners” have given the finder about how they got that much cash.
Play the lottery. It’s safer.