There have been many times over the years when a Brinks truck has overturned, or the security guards forgot to lock the rear doors, and money came out of it while in route to its destination.
Say a person happens to come upon a bag of money that came out of a Brinks truck, and he/she takes it with the sincere intention of returning it to Brinks, but before they do this, they first buy stocks with the money and make a lot of money from this investment.
Then lets say he/she drops off the bag, with the same amount of money that had been in it, to the local Brinks office, say late at night when that office is closed, with a note saying 'I found this bag on the side of the road today. -Anonymous'.
If Brinks does an investigation and is able to track down this person and discovers that he/she had profited on Wall Street using money from a missing bag, will this person go to prison? Is there an existing law(s) that make doing such a thing illegal?