Realistically, what should you do if you find a duffle bag full of money and no-one will know you took it?

First is to hope Anton Chigurh is not looking for it.

Depending on how much it is, say $2 million¹, the best thing to do is to start a cash-only business with a storefront. Make sure you install no surveillance cameras, etc., and aren’t in easy view of anyone else’s.

Run that for a couple of years and gradually feed money into the business. You’ll lose about $150,000 of it to rent, inventory, etc. And another $500,000 or so to taxes, depending on where you live. But at the end you’ll have ~$1.2 million that’s now clean and on which taxes are paid.

That’s the safest but slowest way to do it. Other ways are faster but you might lose more. Or get busted.

1. If in $100 bills, this would weigh around 44 pounds.