For those of you saying you wouldn't keep it, consider the circumstances where/how it was found.
In a plastic box, near the garbage room!
NOBODY misplaces 12 million in that way, unless they are not aware of the funds, possibly forgotten.
IMHO it was extremely stupid for the lady to immediately turn it in, because that is what caused the numerous news reports, and then this "lawyer" shows up claiming it.
If it never hit the news, I bet you would never have heard about anybody losing this money, or claiming it!
Silly lady, had a chance to change her life, and pis*ed it away!
BTW obviously, I would have just kept it in my room (if I lived in the condo) and waited for a month or two before starting to spend it.
IF confronted, I would use the exact same excuse the "lawyer" used, which is I thought the plastic box only had old clothes in it LOL!