How did anything get into those wallets in the first place? If it involved any legitimate business or a known address, they know you had something and will follow up.
If it’s totally off the books, you need to flee to a few countries with lax banking laws before accessing it because you’ll have to explain either the income or non-trivial purchases (“how does a guy reporting $100k salary buy a $500k house in cash?” is the kind of thing which routinely catches small scale crooks).
Do any of that wrong, well, you probably lied to a federal agent and can face severe penalties for that alone.
If it’s totally off the books, you need to flee to a few countries with lax banking laws before accessing it because you’ll have to explain either the income or non-trivial purchases (“how does a guy reporting $100k salary buy a $500k house in cash?” is the kind of thing which routinely catches small scale crooks).
Do any of that wrong, well, you probably lied to a federal agent and can face severe penalties for that alone.