It has become very easy to hide money today. Shell companies are cheap and readily available. They can be had with functional bank accounts, phony board members, and subsidiaries in countries that don't make it easy to obtain ownership information.

You can enjoy your ill-gotten gains by proxy. Instead of taking a million and buying a house, you happen to find a great deal on a rental. Or find a company willing to loan you the money to buy a Ferrari at 0.9% interest with no repayment date stipulated.

Obviously this raises suspicions, but it provides enough cover to make tackling your case onerous enough that probably only a really determined and well-funded Federal prosecution team will come after you.